Update the GCP provider reference so that N4A instances can be validated.
Note: govmomi was set to v0.51.0 because the MAPI updates were causing an automatic
update to v0.52.0 resulting in build issues that have no current solution.
Bump github.com/openshift/api to pick up AWS resource tags
in the infrastructure.config.openshift.io CRD.
* upgrade kubernetes modules to v0.21.0-rc.0
* pin sigs.k8s.io/controller-runtime to v0.9.0-alpha.1