Increase ofagent's grpc timeout

Change-Id: I1f0b9fb81244e4fce3b1c20b7c2c5e97c1d063a8
(cherry picked from commit ecf749772661798fa1c0089d7a34c3422352b4d3)
diff --git a/ofagent/main.py b/ofagent/main.py
index 144a0ad..371d26a 100755
--- a/ofagent/main.py
+++ b/ofagent/main.py
@@ -218,7 +218,7 @@
 
         # May want to specify the gRPC timeout as an arg (in future)
         # Right now, set a default value
-        self.grpc_timeout = 10
+        self.grpc_timeout = 120
 
         verbosity_adjust = (args.verbose or 0) - (args.quiet or 0)
         self.log = setup_logging(self.logconfig,