ci/openshift-ci: Use loop instead of curl --retry-all-errors

[ldoktor]

The --retry-all-errors argument is not supported on the CI runners, use a busy loop instead.

[ldoktor]

@wainersm @gkurz the selinux enablement PR used curl --retry-all-errors which is not supported on the CI runners, this should work.

[ldoktor]

Changes:

• use waitForProcess
• new commit to remove the pre-existing file still consider a hot-fix, I'd like to remove the file completely just wait for the pipeline to stabilize first
• new commit to avoid failures as by default it raises exception on non-zero return unless treated which prevents the cleanup execution (which is something I'd also want to properly address later)

[wainersm]

@beraldoleal mind to review this one?

[ldoktor]

Changes: Added the fixes to commit a message

[wainersm]

/test

[ldoktor]

Changes: Removed the controversial commit that treats grep exception as it's not really related to the changes that are required no.

[gkurz]

/test