Curator Announcer shuts down executor is is passed.

[drcrallen]

https://github.com/druid-io/druid/blob/druid-0.12.0/server/src/main/java/io/druid/curator/announcement/Announcer.java#L148 there is a shutdown call here for the executor which is passed in. The announcer should only manage resources it is passed, and the constructor should be the one managing the executor lifecycle.

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