Fix operator image build for redhat

[RafalSkolasinski]

Fix Operator's Dockerfile.redhat file

[seldondev]

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[RafalSkolasinski]

/test integration

[seldondev]

@RafalSkolasinski: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
integration	57b2437	link	/test integration

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[RafalSkolasinski]

Integration fails on three tests that are currently known to be flaky (and unrelated to changes here)