Rename pg_replication_slot's new active_in to active_pid.

Andres Freund <andres@anarazel.de>

Commit: cef939c3470006c1195a17c2ca3861360587fe15
Author: Andres Freund <andres@anarazel.de>
Date: 2015-04-22T07:43:40Z
Releases: 9.5.0
Rename pg_replication_slot's new active_in to active_pid.

In d811c037ce active_in was added but discussion since showed that
active_pid is preferred as a name.

Discussion: CAMsr+YFKgZca5_7_ouaMWxA5PneJC9LNViPzpDHusaPhU9pA7g@mail.gmail.com

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