Aaron Lehmann 469c5478aa Make Broadcaster Wait function wait for all writers to finish before returning
Also, use the channel to determine if the broadcaster is closed,
removing the redundant isClosed variable.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
Upstream-commit: 4a5d40fdb7896282a1d8b4069a8384ff0af40bed
Component: engine
2015-09-11 10:54:40 -07:00
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