Made job list command skip "stopped" jobs.

* Note that there is often a "stopped job" which actually
  does not exist (it will not show up in ps commands).
* This fixes the pipeline count and the pipeline=1 case.
* This also fixes the "No such process" warning in the signal
  handler when it tried to kill the bogus process.

Change-Id: I3b717a8adea8fb17f89d6d795c69f8562dfb6eb7
Merge "Made job list command skip "stopped" jobs." into production