[SPARK-22129][SPARK-22138] Release script improvements#19359

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holdenk wants to merge 1 commit intoapache:masterfrom

holdenk:SPARK-22129-fix-signing

Commits on Sep 27, 2017

use GPG_KEY to control the GPG key. Add retry. Fix lsof to not be hard coded and just use path version. Remove version swapping on publish-release since we only need it some of the time and it was …
holdenk
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