By default Trove is looking for "RegionOne", if the region is
different the os_region_name parameter needs to be defined withing
the Trove configuration files.

To solve this issue, we need to set "os_region_name" option in
trove-api, trove-taskmanager and trove-conductor configuration.

os_region_name = {{ openstack_region_name }}

Change-Id: I1397046d2c88ba50d01a65c48e021d3535fe39d2
Closes-bug: #1743402