Jakob Borg 764da14440 Improve API/GUI shutdown handling (fixes #2694)
This fixes both a race condition where we could assign s.stop from one
goroutine and then read it from another without locking, and handles the
fact that listener may be nil at shutdown if we've had a bad
CommitConfiguration call in the meantime.
2016-01-17 10:55:26 +01:00
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