Work on issue #2030135: Device sluggish

This adds some new debugging code to make it easier to see why a process is at
a certain oom_adj level -- for example telling you that a certain other process
has a binding to a certain one of its services.  This has helped a lot in
identifying cases where processes are holding references to other processes that
they don't need and thus not allowing the system to get memory it needs.

Also fix a few problems with leaking entries on the service restarting and
service stopping lists.