Migrate flex adapter from drivers

[cofyc]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

• import release-tools (git subtree add --prefix=release-tools https://github.com/kubernetes-csi/csi-release-tools.git master)
• merge flexadapter related commits from drivers (failed because original commits does not pass cla check)
  • git clone git@github.com:kubernetes-csi/drivers.git
  • git filter-branch --index-filter 'git rm --cached -qr --ignore-unmatch -- . && git reset -q $GIT_COMMIT -- app/flexadapter pkg/flexadapter' --prune-empty -- --all
• copy flexadapter files from drivers
• update docs and vendor dependencies

Which issue(s) this PR fixes:

Fixes #1

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[cofyc]

/assign @msau42

[cofyc]

/assign @chakri-nelluri

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[msau42]

@pohly could you help verify the release-tools import was done correctly?

[pohly]

merge flexadapter related commits from drivers - failed because original commits does not pass cla check

We've had that before and it was agreed to by-pass the CLA check (kubernetes-csi/csi-driver-host-path#1) - I personally prefer that over loosing history.

could you help verify the release-tools import was done correctly?

Yes, all looks good and make test passes (which includes checking the release-tools directory).

[cofyc]

OK, I'll update it.

[cofyc]

I think it's better to keep the original commits too.
Reverted back to 30eddaa. PTAL.

[msau42]

/lgtm
/approve

Force merging to skip cla check

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[msau42]

@cofyc can you also help setup test-infra for this repo? Maybe just enable unit test jobs for now until we're ready for image building.

https://github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes-csi