Bug: kubefire install messes with unit files

[rugwirobaker]

Describe the bug
I have recently come to realize that every time there is a new version and I do kubefire installl it modifies my containerd systemd configuration: /etc/systemd/system/containerd.service

Specifically the location of chgrp binary:

....
[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd
ExecStartPost=/usr/bin/chgrp containerd /run/containerd/containerd.sock
....

Running $ which chgrp on my system shows me mine is at /bin/chgrp. Thus on my next start up docker fails to start since it has been changed to usr/bin/chgrp:

 docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/docker.service.d
           └─hosts.conf
   Active: inactive (dead)
     Docs: https://docs.docker.com

Ukw 01 17:26:12 citronus systemd[1]: Dependency failed for Docker Application Container Engine.
Ukw 01 17:26:12 citronus systemd[1]: docker.service: Job docker.service/start failed with result 'dependency'.
Ukw 01 17:26:21 citronus systemd[1]: Dependency failed for Docker Application Container Engine.
Ukw 01 17:26:21 citronus systemd[1]: docker.service: Job docker.service/start failed with result 'dependency'.
Ukw 01 17:26:26 citronus systemd[1]: Dependency failed for Docker Application Container Engine.
Ukw 01 17:26:26 citronus systemd[1]: docker.service: Job docker.service/start failed with result 'dependency'.

To Reproduce
Run kubefire install on a system whose required binaries are not in the expected location.

Expected behavior
Should not modify the unit files without warning or approval

Environment

• OS version

➜  ~ cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.4 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.4 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

• Kubefire version

➜  ~ kubefire version
Version: v0.3.0
Build: 344f34d-20200924143906

• Kubefire runtime info

➜  ~ kubefire info
CONTAINERD	IGNITE	CNI   	RUNC      	CNIPLUGIN                 
v1.4.1    	v0.7.1	v0.8.7	1.0.0-rc92	0.4.0/kubefire-cni-bridge	

Additional context
My docker environment was installed via the official tutorial for Ubuntu system: https://docs.docker.com/engine/install/ubuntu/

[innobead]

@rugwirobaker thanks for reporting!