Log ovs dump-flows at 5, not 4

Most dump-flows calls are part of health checks and don't normally
need to be logged about unless they fail.

pkg/util/ovs/ovs.go

@@ -139,13 +139,17 @@ func New(execer exec.Interface, bridge string, minVersion string) (Interface, er
 }
 
 func (ovsif *ovsExec) exec(cmd string, args ...string) (string, error) {
+	logLevel := glog.Level(4)
 	switch cmd {
 	case OVS_OFCTL:
+		if args[0] == "dump-flows" {
+			logLevel = glog.Level(5)
+		}
 		args = append([]string{"-O", "OpenFlow13"}, args...)
 	case OVS_VSCTL:
 		args = append([]string{"--timeout=30"}, args...)
 	}
-	glog.V(4).Infof("Executing: %s %s", cmd, strings.Join(args, " "))
+	glog.V(logLevel).Infof("Executing: %s %s", cmd, strings.Join(args, " "))
 
 	output, err := ovsif.execer.Command(cmd, args...).CombinedOutput()
 	if err != nil {