Allow to override rgw backends

This patch allows to override rgw backeds to be installed on non
conrtroller nodes by setting
  * ceph_rgw_node0X_hostname
  * ceph_rgw_node0X_address

The change is fully backward compatible as new variables set to ctl0X
by default.

Change-Id: Ice659a8713fb6d3ba45ae541826ecc7af2e9eaf3
1 file changed