s390x rpm support

[cfilleke]

What this PR does / why we need it:

Add support for bazeldnf to maintain the rpm lists for s390x in BUILD.bazel

Add configurations necessary for bazeldnf to generate the rpm lists in WORKSPACE and BUILD.bazel, using the information for how to maintain these lists in .bazelrc, repo.yaml and hack/build/rpm-defs.sh as described in #3089 and #3090

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #3202

Special notes for your reviewer:

• replaces draft PR S390x rpm list maintenance support  #3203

Release note:

kind/enhancement

[kubevirt-bot]

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[cfilleke]

@awels this is the same set of changes as PR #3203 but re-based, signed and merge conflicts resolved.

[cfilleke]

Suggested Test:

make rpm-deps will conduct a smoke test -- that the additions do not break the build and produce the expected result: rpm list updates in the WORKSPACE file, now with rpms for s390x architecture!

But it doesn't check that these rpms are perfectly suited to the application. That would need to happen in the functional test of the fully built operator.

[mhenriks]

/lgtm
/approve

[kubevirt-bot]

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This pull-request has been approved by: mhenriks

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[cfilleke]

/test pull-containerized-data-importer-e2e-destructive

[kubevirt-bot]

@cfilleke: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test pull-containerized-data-importer-e2e-destructive

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[akalenyu]

/test pull-containerized-data-importer-e2e-destructive