Subprojects are about ensuring that code ownership ultimately
lands with a single SIG. There were a few cloud-provider-foo
subprojects that listed dual ownership due to ongoing
discussion of the future of some SIGs. I asked the SIG chairs
involved to make a decision about which SIG these subprojects
should fall to until that discussion is resolved.
cloud-provider-azure -> sig-azure
cloud-provider-gcp -> sig-cloud-provider
cloud-provider-openstack -> sig-cloud-provider