Refactor state machine control functions

This refactor should have been done years ago when we first introduced
the big state machine.  The old functions service_runvel() and the oddly
named service_reload_dynamic() are actually state machine control fns,
so let relocate them.

Also in this commit, remove the global variable 'sm' and rename a few of
the critical functions to better names.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/cgroup.c

@@ -303,7 +303,7 @@ static void cgroup_events_cb(uev_t *w, void *arg, int events)
 
 #ifdef AUTO_RELOAD
 	if (conf_any_change())
-		service_reload_dynamic();
+		sm_reload();
 #endif
 }