Fix incorrect steps in README.md
Fix incorrect steps in README.md

This change does the following:

- merges /etc/openstack_deploy/user_variables.yml with
  rpcd/etc/openstack_deploy/user_variables.yml
- updates an incorrect cp which was resulting in
  /etc/openstack_deploy/openstack_deploy (we also selectively copy
  files to ensure we don't overwrite
  /etc/openstack_deploy/user_variables.yml)

Closes issue #183

byronmccollum/rpc-openstack,andymcc/rpc-openstack,nrb/rpc-openstack,andymcc/rpc-openstack,mattt416/rpc-openstack,claco/rpc-openstack,stevelle/rpc-openstack,xeregin/rpc-openstack,sigmavirus24/rpc-openstack,shannonmitchell/rpc-openstack,darrenchan/rpc-openstack,darrenchan/rpc-openstack,mattt416/rpc-openstack,stevelle/rpc-openstack,mattt416/rpc-openstack,miguelgrinberg/rpc-openstack,andymcc/rpc-openstack,robb-romans/rpc-openstack,xeregin/rpc-openstack,sigmavirus24/rpc-openstack,git-harry/rpc-openstack,stevelle/rpc-openstack,sigmavirus24/rpc-openstack,byronmccollum/rpc-openstack,darrenchan/rpc-openstack,cfarquhar/rpc-openstack,busterswt/rpc-openstack,nrb/rpc-openstack,git-harry/rpc-openstack,major/rpc-openstack,darrenchan/rpc-openstack,prometheanfire/rpc-openstack,busterswt/rpc-openstack,claco/rpc-openstack,miguelgrinberg/rpc-openstack,BjoernT/rpc-openstack,shannonmitchell/rpc-openstack,rcbops/rpc-openstack,sigmavirus24/rpc-openstack,xeregin/rpc-openstack,claco/rpc-openstack,mancdaz/rpc-openstack,BjoernT/rpc-openstack,jacobwagner/rpc-openstack,rcbops/rpc-openstack,byronmccollum/rpc-openstack,hughsaunders/rpc-openstack,prometheanfire/rpc-openstack,galstrom21/rpc-openstack,mancdaz/rpc-openstack,nrb/rpc-openstack,robb-romans/rpc-openstack,major/rpc-openstack,hughsaunders/rpc-openstack,cfarquhar/rpc-openstack,galstrom21/rpc-openstack,miguelgrinberg/rpc-openstack,jacobwagner/rpc-openstack,cloudnull/rpc-openstack,busterswt/rpc-openstack,xeregin/rpc-openstack,cloudnull/rpc-openstack