Adding KubeVirt Cloud Provider

[moadqassem]

What this PR does / why we need it:
Adding Kubevirt cloud provider

Release note:

Adding kubevirt initial cloud provider 

[CLAassistant]

All committers have signed the CLA.

[mfranczy]

/lgtm
/approve

[gardener-robot]

@mfranczy Command /approve is not known.

[mvladev]

Some changes are needed.

[stoyanr]

Thanks for the PR! Please see the comments on the specific lines of code, some of them apply to multiple files, please fix them everywhere. Also, please:

• Squash all commits into one (Gardener policy)
• Add a VERSION file
• Add .ci scripts from https://github.com/gardener/machine-controller-manager-provider-vsphere and make sure all Makefile targest work
• Do make revendor, currently some files are not properly vendored

[stoyanr]

@moadqassem Could you also please add install-requirements, format, check-generate, generate, test-cov, test-clean, verify, and verify-extended targets to the Makefile? As an example, see https://github.com/gardener/gardener-extension-provider-kubevirt/blob/master/Makefile. Please also change check and test target to use /vendor/github.com/gardener/gardener/hack. Then, when #4 is merged, we would get a verify check on future PRs.

[stoyanr]

@moadqassem Thanks for addressing all remaining comments! Please see a new comment that I think is probably a bug.
Reg. my comments about adding additional targets to the Makefile using Gardener hack scripts, that could also be addressed in a future PR.

[moadqassem]

@moadqassem Thanks for addressing all remaining comments! Please see a new comment that I think is probably a bug.
Reg. my comments about adding additional targets to the Makefile using Gardener hack scripts, that could also be addressed in a future PR.

Yeah I will take care of that :-). I also still need to squash my comments and wait for another PR to be merged on the original repo(it is a PR that @mfranczy has opened regarding Dockerfile)

[mfranczy]

@moadqassem the docker file PR has been rebased moadqassem#1

[stoyanr]

Thanks for addressing the constructor issue! Some more requests:

• Please add +x flag on .ci/build and .ci/check.
• Please fix all linter issues:

$ make check
Running go vet...
# github.com/gardener/machine-controller-manager-provider-kubevirt/cmd/machine-controller
cmd/machine-controller/main.go:45:3: Fprint call has possible formatting directive %v
make: *** [check] Error 2

• Please add a verify target that calls test and check. We should use it for a verify check (until we add verify-extended as suggested previously).

mvladev is in vacation and his comments have been already addressed