Adds the functionality to redeploy a server in an unguarded fashion,
meaning that the server will not be pre-validated to be in a state that
workloads have been removed.
This is the first targeted action for Shipyard, so a refactoring of the
validators to support more flexibility has been done.
Also adds RBAC controls for specific actions being created, rather than
a binary create action privilege.
Change-Id: I39e3dab6595c5187affb9f2b6edadd0f5f925b0c
f3749ca3f9