pg_rewind: Improve some messages

Peter Eisentraut <peter_e@gmx.net>

Commit: cdcae2b6a7d263b2771b6386af626b47ce17da19
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2015-10-02T01:42:00Z
Releases: 9.6.0
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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