Some TODOs after merge PR #15

[pokerfaceSad]

Thanks for @ilyee add gang scheduling support in #15 which means gang scheduler can be selected when we add multi GPUs.

And still sth. need to fix:

• Add the relevant docs

• Add the relevant RESTful API

• allocator/allocator.go:159 log format error

• need to input all GPU uuids when unmount after gang mount

[ilyee]

I'll do this

[pokerfaceSad]

Done in #17 and 7036133🎉🎉