Make ServiceNetwork optional in IPSetReservration

[rabi]

jira: https://issues.redhat.com/browse/OSPRH-11679

[stuggi]

/lgtm

[openshift-ci]

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/6453503938b843d2841542ce418c63f5

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 30m 43s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 16m 29s
❌ cifmw-crc-podified-edpm-baremetal RETRY_LIMIT in 20m 40s

[stuggi]

recheck

[stuggi]

/cherry-pick 18.0-fr1

[openshift-cherrypick-robot]

@stuggi: new pull request created: #310

In response to this:

/cherry-pick 18.0-fr1

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