[release-4.20] HyperShift: relax ovnkube-control-plane zone anti-affinity

[ricky-rav]

The required zone in the anti-affinity section on the managed ovnkube-control-plane deployment can prevent scheduling when the management cluster has one zone only. Replace it with a hard hostname anti-affinity (guaranteeing that two replicas land on different nodes) and a soft zone anti-affinity (preferring different zones when possible).

(cherry picked from commit 223579a) (cherry picked from commit c120f3d)

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@ricky-rav: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	859ceca	link	false	/test security
ci/prow/e2e-ovn-ipsec-step-registry	859ceca	link	true	/test e2e-ovn-ipsec-step-registry
ci/prow/e2e-metal-ipi-ovn-ipv6-ipsec	859ceca	link	true	/test e2e-metal-ipi-ovn-ipv6-ipsec
ci/prow/e2e-aws-ovn-serial-2of2	859ceca	link	true	/test e2e-aws-ovn-serial-2of2
ci/prow/e2e-aws-ovn-upgrade	859ceca	link	true	/test e2e-aws-ovn-upgrade

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