Add package of Sirupsen/logrus to vendor

[xiekeyang]

supplement of #103. Here we need fix 2:

1. golint failed upper that go version 1.7
2. add logrus package. Refer to Merging of subcommands #103 (comment)

Signed-off-by: xiekeyang [email protected]

[xiekeyang]

I find github.com/vbatts/git-validation can help install non-existent packages to local, such as logrus, that pass travis CI. But I think we had better to keep as previous rules, to add needed package to glide.yaml, and commit it with code under vendor (for we should release buildable image tool package ), it is right?

[stevvooe]

LGTM

[coolljt0725]

LGTM