OVA: manually remove PVs attached to ova provider once it deleted. #2272

Job	Run time
build	4m 34s
ci_setup (ubuntu-latest, ovirt)	11m 17s
ci_setup (ubuntu-latest, vsphere)	10m 4s
ci_setup (ubuntu-latest, openstack)	13m 38s
ci_setup (ubuntu-latest, ova)	9m 3s
	48m 36s

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