Add maxCallRecvMsgSize parameter and read it from the configuration
GRPC client max msg receive size
file. It allows to set if the incoming message is bigger than the
default 4K size.

Change-Id: I5b5113264066b84b5b055faf7d4bc02a3f11ec89
diff --git a/voltctl.config b/voltctl.config
index f07a75b..857219a 100644
--- a/voltctl.config
+++ b/voltctl.config
@@ -9,5 +9,6 @@
   verify: ""
 grpc:
   timeout: 5m0s
+  maxCallRecvMsgSize: 4MB
 kvstoreconfig:
   timeout: 5s