conncache: Reduce log level of resolve failure.

This log is very common in an offline scenario.

Change-Id: If2695e21126810800c0c7661a8b06473bff8b365
diff --git a/runtime/internal/flow/manager/conncache.go b/runtime/internal/flow/manager/conncache.go
index ed7326a..7645c14 100644
--- a/runtime/internal/flow/manager/conncache.go
+++ b/runtime/internal/flow/manager/conncache.go
@@ -344,7 +344,7 @@
 	network, addresses, err := resolve(ctx, p, network, address)
 	if err != nil {
 		// TODO(suharshs): Add a unittest for failed resolution.
-		ctx.Errorf("Failed to resolve (%v, %v): %v", network, address, err)
+		ctx.VI(2).Infof("Failed to resolve (%v, %v): %v", network, address, err)
 		return nil, nil, nil, nil
 	}