Add clean cache command

[innobead]

Is your feature request related to a problem? Please describe.
Sometimes, you get something running incorrectly and would like to clean up ignite cache like imported images like #32 . It's better to have a command to clean up.

Describe the solution you'd like
The clean cache command like uninstall but focus on deleting clusters and ignite caches.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[innobead]

➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cache show
TYPE        	PATH                                                                              	DESCRIPTION                                                                                                                                                  
bootstrapper	/home/davidko/.kubefire/bootstrappers/v0.3.0-6-g00c4f6f-dirty/k3s/v1.19.2.yaml    	                                                                                                                                                            	
bootstrapper	/home/davidko/.kubefire/bootstrappers/v0.3.0-6-g00c4f6f-dirty/kubeadm/v1.19.2.yaml	                                                                                                                                                            	
node        	ghcr.io/innobead/kubefire-opensuse-leap:15.2                                      	ghcr.io/innobead/kubefire-opensuse-leap:15.2,ghcr.io/innobead/kubefire-opensuse-leap@sha256:fc45271a766714d35482c591527ef066757a30d0d8653b7c1b190a4df825fd4c	
node        	ghcr.io/innobead/kubefire-ignite-kernel:4.19.125-amd64                            	ghcr.io/innobead/kubefire-ignite-kernel@sha256:5ef990079faff6b906bcd7aee76c1995a8c24b3f261e8bccdf63cf677664d31e                                             	
➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cache delete
INFO[2020-09-30T13:34:06+08:00] Delete local cache dir /home/davidko/.kubefire/bootstrappers 
INFO[2020-09-30T13:34:06+08:00] Delete local cache dir /home/davidko/.kubefire/bin 
INFO[2020-09-30T13:34:06+08:00] Delete node caches                           
INFO[2020-09-30T13:34:06+08:00] Deleting ignite image caches                 
INFO[2020-09-30T13:34:06+08:00] time="2020-09-30T13:34:06+08:00" level=fatal msg="unable to remove, image \"1349978f10fcac26\" is in use by VM \"a37ce10f67eb3142\"" 
ERRO[2020-09-30T13:34:06+08:00] failed to delete  caches: exit status 1      
➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cache show  
TYPE	PATH                                                  	DESCRIPTION                                                                                                                                                  
node	ghcr.io/innobead/kubefire-opensuse-leap:15.2          	ghcr.io/innobead/kubefire-opensuse-leap:15.2,ghcr.io/innobead/kubefire-opensuse-leap@sha256:fc45271a766714d35482c591527ef066757a30d0d8653b7c1b190a4df825fd4c	
node	ghcr.io/innobead/kubefire-ignite-kernel:4.19.125-amd64	ghcr.io/innobead/kubefire-ignite-kernel@sha256:5ef990079faff6b906bcd7aee76c1995a8c24b3f261e8bccdf63cf677664d31e                                             	
➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cluster rm demo demo2 demo3
INFO[2020-09-30T13:34:30+08:00] deleting cluster                              cluster=demo force=false
INFO[2020-09-30T13:34:30+08:00] deleting master nodes                         cluster=demo
INFO[2020-09-30T13:34:30+08:00] deleting node                                 node=demo-master-1
INFO[2020-09-30T13:34:30+08:00] time="2020-09-30T13:34:30+08:00" level=info msg="Removing the container with ID \"ignite-cfe41e72cb60bb8f\" from the \"cni\" network" 
INFO[2020-09-30T13:34:31+08:00] time="2020-09-30T13:34:31+08:00" level=info msg="Removed VM with name \"demo-master-1\" and ID \"cfe41e72cb60bb8f\"" 
INFO[2020-09-30T13:34:31+08:00] deleting worker nodes                         cluster=demo
INFO[2020-09-30T13:34:31+08:00] deleting cluster configurations               cluster=demo
INFO[2020-09-30T13:34:31+08:00] deleting cluster                              cluster=demo2 force=false
INFO[2020-09-30T13:34:31+08:00] deleting worker nodes                         cluster=demo2
INFO[2020-09-30T13:34:31+08:00] deleting master nodes                         cluster=demo2
INFO[2020-09-30T13:34:31+08:00] deleting node                                 node=demo2-master-1
INFO[2020-09-30T13:34:31+08:00] time="2020-09-30T13:34:31+08:00" level=info msg="Removing the container with ID \"ignite-b1b83effd706b379\" from the \"cni\" network" 
INFO[2020-09-30T13:34:32+08:00] time="2020-09-30T13:34:32+08:00" level=info msg="Removed VM with name \"demo2-master-1\" and ID \"b1b83effd706b379\"" 
INFO[2020-09-30T13:34:32+08:00] deleting cluster configurations               cluster=demo2
INFO[2020-09-30T13:34:32+08:00] deleting cluster                              cluster=demo3 force=false
INFO[2020-09-30T13:34:32+08:00] deleting master nodes                         cluster=demo3
INFO[2020-09-30T13:34:32+08:00] deleting node                                 node=demo3-master-1
INFO[2020-09-30T13:34:32+08:00] time="2020-09-30T13:34:32+08:00" level=info msg="Removing the container with ID \"ignite-a37ce10f67eb3142\" from the \"cni\" network" 
INFO[2020-09-30T13:34:33+08:00] time="2020-09-30T13:34:33+08:00" level=info msg="Removed VM with name \"demo3-master-1\" and ID \"a37ce10f67eb3142\"" 
INFO[2020-09-30T13:34:33+08:00] deleting worker nodes                         cluster=demo3
INFO[2020-09-30T13:34:33+08:00] deleting cluster configurations               cluster=demo3
➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cache show                 
TYPE	PATH                                                  	DESCRIPTION                                                                                                                                                  
node	ghcr.io/innobead/kubefire-opensuse-leap:15.2          	ghcr.io/innobead/kubefire-opensuse-leap:15.2,ghcr.io/innobead/kubefire-opensuse-leap@sha256:fc45271a766714d35482c591527ef066757a30d0d8653b7c1b190a4df825fd4c	
node	ghcr.io/innobead/kubefire-ignite-kernel:4.19.125-amd64	ghcr.io/innobead/kubefire-ignite-kernel@sha256:5ef990079faff6b906bcd7aee76c1995a8c24b3f261e8bccdf63cf677664d31e                                             	
➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cache delete
INFO[2020-09-30T13:34:48+08:00] Delete local cache dir /home/davidko/.kubefire/bootstrappers 
INFO[2020-09-30T13:34:48+08:00] Delete local cache dir /home/davidko/.kubefire/bin 
INFO[2020-09-30T13:34:48+08:00] Delete node caches                           
INFO[2020-09-30T13:34:48+08:00] Deleting ignite image caches                 
INFO[2020-09-30T13:34:48+08:00] 1349978f10fcac26                             
INFO[2020-09-30T13:34:48+08:00] 386b444f63b9373b                             
➜  kubefire (master) ✗ ./target/kubefire-linux-amd64 cache show  
Not found