lib.of_config: import ryu.contrib

import ryu.contrib by ourself for the benefit of programs
which doesn't use other ryu.contrib stuffs like oslo.config.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/lib/of_config/__init__.py

@@ -18,6 +18,8 @@ import glob
 import os.path
 import sys
 
+import ryu.contrib  # we require ncclient
+
 SCHEMA_DIR = os.path.dirname(__file__)
 
 _PREFIX = 'of-config-'