add fsctl flush_db_handles to expire any unused db handles

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15982 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core.c

@@ -1568,6 +1568,9 @@ SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, int32_
 	}
 
 	switch (cmd) {
+	case SCSC_FLUSH_DB_HANDLES:
+		switch_cache_db_flush_handles();
+		break;
 	case SCSC_SEND_SIGHUP:
 		handle_SIGHUP(1);
 		break;