updated logic for pg master / standby and split out region number.

library/cassandra_hosts.py

diff --git a/library/cassandra_hosts.py b/library/cassandra_hosts.py
index c1f4ad4..9d2b773 100644
--- a/library/cassandra_hosts.py
+++ b/library/cassandra_hosts.py
@@ -62,7 +62,9 @@
             else:
                 region = cassandra_groups[cassandra_group_name][ds_ip]['region']
 
-            cassandra_groups[cassandra_group_name][ds_ip]['private_ip'] = cassandra_groups[cassandra_group_name][ds_ip]['private_ip'] + ":" + str(region) + ',' + str(rack)
+            region_nums = region.split('-')
+
+            cassandra_groups[cassandra_group_name][ds_ip]['private_ip'] = cassandra_groups[cassandra_group_name][ds_ip]['private_ip'] + ":" + str(region_nums[1]) + ',' + str(rack)
     return cassandra_groups