Disable upgrade.sh for r13.0.0
Disable upgrade.sh for r13.0.0

The next major release is the first in RPCO with support for Mitaka. The
release will not support upgrading from Liberty. The purpose of this
commit is to prevent any unintended consequenses from mistakenly running
upgrade.sh on an existing deployment.

Issue: https://github.com/rcbops/u-suk-dev/issues/158

prometheanfire/rpc-openstack,major/rpc-openstack,xeregin/rpc-openstack,sigmavirus24/rpc-openstack,major/rpc-openstack,byronmccollum/rpc-openstack,byronmccollum/rpc-openstack,sigmavirus24/rpc-openstack,jacobwagner/rpc-openstack,sigmavirus24/rpc-openstack,cloudnull/rpc-openstack,sigmavirus24/rpc-openstack,darrenchan/rpc-openstack,git-harry/rpc-openstack,mancdaz/rpc-openstack,git-harry/rpc-openstack,hughsaunders/rpc-openstack,rcbops/rpc-openstack,cloudnull/rpc-openstack,darrenchan/rpc-openstack,darrenchan/rpc-openstack,BjoernT/rpc-openstack,byronmccollum/rpc-openstack,xeregin/rpc-openstack,cfarquhar/rpc-openstack,shannonmitchell/rpc-openstack,xeregin/rpc-openstack,xeregin/rpc-openstack,mancdaz/rpc-openstack,cfarquhar/rpc-openstack,rcbops/rpc-openstack,robb-romans/rpc-openstack,BjoernT/rpc-openstack,jacobwagner/rpc-openstack,galstrom21/rpc-openstack,hughsaunders/rpc-openstack,robb-romans/rpc-openstack,shannonmitchell/rpc-openstack,galstrom21/rpc-openstack,prometheanfire/rpc-openstack,darrenchan/rpc-openstack