Moved scheduler from containers back to being a global.

It makes more sense to have a scheduler (or runqueue pair) per-cpu
rather than per-container. This provides more flexible global scheduling
policy that is also simpler due to all scheduling details being controlled
from a single point.

src/generic/container.c

@@ -27,8 +27,6 @@ int container_init(struct container *c)
 	for (int i = 0; i < CONFIG_MAX_PAGERS_USED; i++)
 		cap_list_init(&c->pager[i].cap_list);
 
-	/* Init scheduler */
-	sched_init(&c->scheduler);
 
 	return 0;
 }