agent: Temporarily comment out log message in the agents cache.

This message now pops up spuriously during shutdown.  This is
due to v.io/c/10817.

Change-Id: I2cb306475a7e3143d1271eda81675516a695ec89
diff --git a/services/agent/internal/cache/cache.go b/services/agent/internal/cache/cache.go
index 252b6a3..e0e7026 100644
--- a/services/agent/internal/cache/cache.go
+++ b/services/agent/internal/cache/cache.go
@@ -380,7 +380,10 @@
 		for {
 			if recvErr := call.Recv(&x); recvErr != nil {
 				if ctx.Err() != context.Canceled {
-					vlog.Infof("Error from agent: %v", recvErr)
+					// TODO(mattr): For now I'm commenting this out since the context
+					// doesn't get cancelled before the client is closed.
+					// Revisit this.
+					vlog.VI(2).Infof("Error from agent: %v", recvErr)
 				}
 				flush()
 				call.Finish()