Migrate from glide to godep

[andyxning]

This PR is part of #74 .

This PR keep node-feature-discovery skeleton in sync with kubernetes-template-project.

Note: This PR also migrate vendor management tool from glide to godep.

This PR should be accepted after #75 .
/cc @ConnorDoyle @balajismaniam

[balajismaniam]

@andyxning For graduating to beta, I don't think it is necessary to move from glide to godep. Closing this PR for now.

[andyxning]

Make node-feature-discovery's skeleton suitable for an kubernetes repo should be done ASAP, imo.

WDYT @dchen1107 @balajismaniam

[ConnorDoyle]

I think @balajismaniam's point is that the template project is not prescriptive at all about go dependency manager tooling, and therefore isn't relevant to beta graduation.

[andyxning]

@ConnorDoyle

That was my mistake. I mixed two logical different commits into one. The reason for doing this is that as stated in the template project godep is suggested(maybe it is not a strong restrict because moving to glide has actually been discussed in Kubernetes.). But for now, i think it should be ok to be compatible with it. :)