Turn off WalSender keepalives by default, users can enable if desired

Simon Riggs <simon@2ndQuadrant.com>

Commit: da4efa13d801ccc179f1d2c24d8a60c4a2f8ede9
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2012-08-09T16:07:03Z
Releases: 9.3.0
Turn off WalSender keepalives by default, users can enable if desired

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