Add dep check to CI/CD cycle

[tariq1890]

As per the latest go-dev docker image, we are using the latest release of dep which includes the check feature.

dep check essentially ensures that vendor directories, source imports, and the toml files are in sync. It works fast and it is much better than calling dep ensure and performing a diff.

Possible scenarios when this could be useful

I) When a developer adds a new dependency but forgets to check in the vendor files.
ii) When a dev adds new imports and it only compiles in their local machine (because of their local gopath) but forgets to add the corresponding the dep stuff. dep check will detect this loss of sync immediately.
iii) Inconsistencies caused due to conflicting transitive dependencies.

If you are okay with this, I can proceed with the required changes, :). More details over here

golang/dep#1932