Update Imports

[thandayuthapani]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

What happened:
I see imports used in files with format "volcano.sh/volcano/XXX/XXX/XXX"

What you expected to happen:
It should of the format "github.com/volcano-sh/volcano/XXX/XXX/XXX"

[thandayuthapani]

If this changes has to be done, I can raise a PR @k82cn

[k82cn]

let's keep volcano.sh/volcano/xxx , sismilar to k8s.io/xxx

[thandayuthapani]

Then I will close this issue.