Minor tweak to region config in boto configuration file

lib/ansible/module_utils/ec2.py

@@ -71,7 +71,9 @@ def get_ec2_creds(module):
             region = os.environ['AWS_REGION']
         else:
             # boto.config.get returns None if config not found
-            region = boto.config.get('Boto', 'ec2_region_name')
+	    region = boto.config.get('Boto', 'aws_region')
+            if not region:
+                region = boto.config.get('Boto', 'ec2_region')
 
     return ec2_url, ec2_access_key, ec2_secret_key, region