[cloud] Add support for AWS China to elasticache_subnet_group role (#24286)

lib/ansible/modules/cloud/amazon/elasticache_subnet_group.py

@@ -71,8 +71,7 @@ EXAMPLES = '''
 
 try:
     import boto
-    from boto.elasticache.layer1 import ElastiCacheConnection
-    from boto.regioninfo import RegionInfo
+    from boto.elasticache import connect_to_region
     from boto.exception import BotoServerError
     HAS_BOTO = True
 except ImportError:
@@ -115,9 +114,7 @@ def main():
 
     """Get an elasticache connection"""
     try:
-        endpoint = "elasticache.%s.amazonaws.com" % region
-        connect_region = RegionInfo(name=region, endpoint=endpoint)
-        conn = ElastiCacheConnection(region=connect_region, **aws_connect_kwargs)
+        conn = connect_to_region(region_name=region, **aws_connect_kwargs)
     except boto.exception.NoAuthHandlerFound as e:
         module.fail_json(msg=e.message)