pg_rewind: Improve some messages

Peter Eisentraut <peter_e@gmx.net>

Commit: 0f51a848ab98325e497a227155648facd9d0cf9b
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2015-10-02T01:52:46Z
Releases: 9.5.0
pg_rewind: Improve some messages

The output of a typical pg_rewind run contained a mix of capitalized and
not-capitalized and punctuated and not-punctuated phrases for no
apparent reason.  Make that consistent.  Also fix some problems in other
messages.

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