Support Alpine Linux #194

[kotakanbe]

What did you implement:

• Support Alpine Linux
• Change the login shell of the server to be scanned from /bin/bash to /bin/sh

Closes #194

How did you implement it:

see diff

How can we verify it:

• Alpine Linux v3.6.2 is running on Docker Host

root@u16-kanbe:~# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
05b81f5a7f93        alpine              "/bin/sh"           11 days ago         Up 26 hours                             youthful_wozniak
root@u16-kanbe:~# docker exec -it youthful_wozniak /bin/sh
/ # cat /etc/alpine-release
3.6.2

• Fetch Alpine SecDB

$ cd $GOPATH/src/github.com/kotakanbe/goval-dictionary/
$ ./goval-dictionary fetch-alpine 3.6
[Dec  1 22:20:41]  INFO Fetching... https://git.alpinelinux.org/cgit/alpine-secdb/plain/v3.6/community.yaml

[Dec  1 22:20:41]  INFO Fetching... https://git.alpinelinux.org/cgit/alpine-secdb/plain/v3.6/main.yaml
[Dec  1 22:20:44]  WARN Not supported range access.
community.yaml: 0 B / 5.52 KiB [---------------------------------------------------------------]   0.00%
community.yaml: 5.52 KiB / 5.52 KiB [==========================================================] 100.00%
main.yaml: 18.28 KiB / 18.28 KiB [=============================================================] 100.00%
[Dec  1 22:20:45]  INFO Finished to fetch OVAL definitions.
[Dec  1 22:20:45]  INFO   551 CVEs

• Scan Alpine Linux
  config.toml

  [servers.u16idcf]
    host = "x.x.x.x"
    port = "22"
    keyPath = "/Users/kotakanbe/.ssh/id_rsa"
    [servers.u16idcf.containers]
      includes = ["youthful_wozniak"]

• Scan

go build ; and ./vuls scan --containers-only  u16idcf
[Dec  1 22:24:24]  INFO [localhost] Start scanning
[Dec  1 22:24:24]  INFO [localhost] config: /Users/kotakanbe/go/src/github.com/future-architect/vuls/config.toml
[Dec  1 22:24:24]  INFO [localhost] Validating config...
[Dec  1 22:24:24]  INFO [localhost] Detecting Server/Container OS...
[Dec  1 22:24:24]  INFO [localhost] Detecting OS of servers...
[Dec  1 22:24:28]  INFO [localhost] (1/1) Detected: u16idcf: ubuntu 16.04
[Dec  1 22:24:28]  INFO [localhost] Detecting OS of containers...
[Dec  1 22:24:42]  INFO [localhost] Detected: youthful_wozniak@u16idcf: alpine 3.6.2
[Dec  1 22:24:42]  INFO [localhost] Detecting Platforms...
[Dec  1 22:24:46]  INFO [localhost] (1/1) youthful_wozniak on u16idcf is running on other
[Dec  1 22:24:46]  INFO [localhost] Scanning vulnerabilities...
[Dec  1 22:24:46]  INFO [localhost] Scanning vulnerable OS packages...


One Line Summary
================
youthful_wozniak@u16idcf        alpine3.6.2     36 updatable packages

• report

$ go build ; and ./vuls report --format-one-line-text
[Dec  1 22:28:32]  INFO [localhost] Validating config...
[Dec  1 22:28:32]  INFO [localhost] cve-dictionary: /Users/kotakanbe/go/src/github.com/future-architect/vuls/cve.sqlite3
[Dec  1 22:28:32]  INFO [localhost] Loaded: /Users/kotakanbe/go/src/github.com/future-architect/vuls/results/2017-12-01T22:24:46+09:00


One Line Summary
================
youthful_wozniak@u16idcf        Total: 11 (High:1 Medium:7 Low:0 ?:3)   36 updatable packages

Todos:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: NO
Is it a breaking change?: NO