This patch proposes a (rather major) refactor to the L3 scheduler.
Basically, the auto_schedule_routers() code-path was split to 2
different code-paths, each dealing with a different case (unscheduled
routers vs underscheduled routers), in addition to the API-initiated
schedule() logic. This patch removes the 2 code-paths in favor of moving
most of the logic into schedule(). While the result is a slightly
longer schedule(), the benefit is that a lot of the previous
unmaintainable code-paths of auto_schedule_routers() are now removed.
Yay! :D
Related-Bug: #1609738
Change-Id: I227ca60422545e40d3bbb8baf2b41a8ce14f4294
e4b0b9f8be