add image license test (GoogleCloudPlatform#107)

* add image license test

* fix go lint

* fix gocheck

* adress comment

* fix package name

* fix gocheck

* rebase conflict

* LICENSE

* add vm in setup to run test

* add distrios support

* rename

* rename

* fix typo

* fix

* refactor

* address comment

* fix

* address comment

* remove log

* address comment

* address comment

* address comment

* small fix

go.mod

@@ -4,10 +4,7 @@ go 1.13
 
 require (
 	cloud.google.com/go/storage v1.14.0
-	github.com/GeertJohan/go.rice v1.0.2 // indirect
 	github.com/GoogleCloudPlatform/compute-image-tools/daisy v0.0.0-20210416002445-25d654193a83
-	github.com/ains/go-test-html v0.0.0-20161021131355-c8eb28a2a5f2 // indirect
-	github.com/daaku/go.zipexe v1.0.1 // indirect
 	github.com/golang/protobuf v1.5.1 // indirect
 	github.com/google/go-github v17.0.0+incompatible
 	github.com/google/go-querystring v1.0.0 // indirect