Keystone region name option redefined
Keystone region name option redefined

Keystone region name defined at line 489 and line 558.Reduce a
redundant one.

Change-Id: Ic358963ecb09b6c2cb2ab6ba7ee8179a22188a21

openstack/monasca-api,openstack/monasca-api,openstack/monasca-api,stackforge/monasca-api,stackforge/monasca-api,stackforge/monasca-api,stackforge/monasca-api