+/* Updates the OpenFlow flow table for the current state of in-band control.
+ * Returns true ordinarily. Returns false if no remotes are configured on 'ib'
+ * and 'ib' doesn't have any rules left to remove from the OpenFlow flow
+ * table. Thus, a false return value means that the caller can destroy 'ib'
+ * without leaving extra flows hanging around in the flow table. */
+bool