NO-ISSUE: Fix manage_hypervisor_config.sh script to finish cleanup procedure

[ggiguash]

Minor fix in the cleanup procedure to avoid errors like the following, which aborts the script in the middle:

$ bash -x ./test/bin/manage_hypervisor_config.sh cleanup
...
...
+ sudo virsh net-info isolated
+ sudo virsh net-info ipv6
++ sudo virsh net-dumpxml ipv6
++ yq -p xml .network.bridge.+@name
+ bridge_name=virbr3
+ sudo ip link del name virbr3p0
Cannot find device "virbr3p0"

[openshift-ci-robot]

@ggiguash: This pull request explicitly references no jira issue.

In response to this:

Minor fix in the cleanup procedure to avoid errors like there stopping the script in the middle:

$ bash -x ./test/bin/manage_hypervisor_config.sh cleanup
...
...
+ sudo virsh net-info isolated
+ sudo virsh net-info ipv6
++ sudo virsh net-dumpxml ipv6
++ yq -p xml .network.bridge.+@name
+ bridge_name=virbr3
+ sudo ip link del name virbr3p0
Cannot find device "virbr3p0"

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash

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[openshift-ci]

@ggiguash: 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/microshift-metal-tests-arm	afa4a8f	link	true	/test microshift-metal-tests-arm
ci/prow/metal-periodic-test-arm	afa4a8f	link	true	/test metal-periodic-test-arm
ci/prow/metal-bootc-periodic-test-arm	afa4a8f	link	true	/test metal-bootc-periodic-test-arm
ci/prow/metal-periodic-test	afa4a8f	link	true	/test metal-periodic-test
ci/prow/metal-bootc-periodic-test	afa4a8f	link	true	/test metal-bootc-periodic-test
ci/prow/microshift-metal-tests	afa4a8f	link	true	/test microshift-metal-tests
ci/prow/metal-bootc-test-arm	afa4a8f	link	true	/test metal-bootc-test-arm

Full PR test history. Your PR dashboard.

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