Add RefStack/DefCore documentation
Add RefStack/DefCore documentation

This patch adds documentation for running RefStack against RPC
deployments, which is required for DefCore compliance.

connected rcbops/u-suk-dev#414

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