SPLAT-901: set default for variables that are deprecated by failure_domains

[rvanderp3]

With the addition of failure_domains, some variables are deprecated and still may be used. Since these variables may validly be left empty when failure_domains is used, defaults are now being provided for those variables.

cc: @jcpowermac

[jcpowermac]

/lgtm
/approve

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD ed8b918 and 2 for PR HEAD 4215613 in total

[rvanderp3]

/retest-required

[rvanderp3]

/test e2e-vsphere-ovn
/test e2e-openstack-ovn

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 01ebce5 and 1 for PR HEAD 4215613 in total

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@rvanderp3: 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/e2e-aws-ovn-upgrade	4215613	link	false	/test e2e-aws-ovn-upgrade
ci/prow/e2e-aws-ovn-disruptive	4215613	link	false	/test e2e-aws-ovn-disruptive

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 14878f7 and 0 for PR HEAD 4215613 in total