Adapts new API response schema

This PR makes troveclient to handle API response in new data schema.
Trove API response data schema has changed by the commit[1].

Original problem is that python-troveclient can't parse a API response
data in new data schema, resulting in an error.

[1]: 429c39890e

Task: 44986
Story: 2009979
Change-Id: I2e446c68c3b82c11d13f6bace54273c109e02069

troveclient/osc/v1/database_clusters.py

@@ -35,7 +35,13 @@ def set_attributes_for_print_detail(cluster):
         info['task_name'] = cluster.task['name']
     info.pop('task', None)
     if hasattr(cluster, 'ip'):
-        info['ip'] = ', '.join(cluster.ip)
+        ip = []
+        for addr in cluster.ip:
+            if isinstance(addr, dict):
+                ip.append(addr['address'])
+            else:
+                ip.append(addr)
+        info['ip'] = ', '.join(ip)
     instances = info.pop('instances', None)
     if instances:
         info['instance_count'] = len(instances)