RBAC Migration Followup #25: Deprecate policy commands in favor of RBAC equivalents

Add cobra.Command.Deprecated to the following commands:

1. oc adm policy {add|remove}-{cluster-}role-{to|from}-{user|group} ---> oc {create|edit} {cluster}role{binding}
2. oc adm policy reconcile-cluster-role-{bindings} ---> oc auth reconcile
3. oc policy can-i ---> oc auth can-i
4. oc adm policy remove-{user|group} ---> oc {delete|edit} rolebinding
5. Update docs https://docs.openshift.org/latest/admin_guide/manage_rbac.html#managing-role-bindings
6. Update ansible playbooks to use RBAC commands instead

Deprecated should contain a pointer to the RBAC equivalent command. The CLI completions will have to be regenerated since we do not include completions for deprecated commands.

@liggitt @deads2k any others come to mind?

cc @bparees @openshift/sig-security @juanvallejo @fabianofranz