Refactor the long-hated users recipe into an HWRP

Ready for review:

* Refactor users recipe into an HWRP called opc_users which is compatible with EC11 and CS12
* Smarter logic to wait for HA master and then for erchef readyness, which helps this complete much faster
* No ponies were hurt in the making of this code
Rainbow Dash is a member of Wonderbolts reserves and was promoted to Lead Pony in Wonderbolts training in the episode "Wonderbolts Academy". Should she be in both orgs?