Add missing ryu.contrib.update_module_path calls

Found by investigating readthedocs logs.

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

ryu/lib/ovs/db_client.py

@@ -17,6 +17,9 @@
 import logging
 import os
 
+import ryu.contrib
+ryu.contrib.update_module_path()
+
 from ovs import (jsonrpc,
                  stream)
 from ovs import util as ovs_util

ryu/lib/ovs/vsctl.py

@@ -22,6 +22,9 @@ import os
 import sys
 import weakref
 
+import ryu.contrib
+ryu.contrib.update_module_path()
+
 import ovs.db.data
 import ovs.db.types
 import ovs.poller