Change default of log_directory to 'log'

Peter Eisentraut <peter_e@gmx.net>

Commit: 3371e4d9b12455fe1f8d1516d0bd915aab86be17
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-03-27T14:34:33Z
Releases: 10.0
Change default of log_directory to 'log'

The previous default 'pg_log' might have indicated by its "pg_" prefix
that it is an internal system directory.  The new default is more in
line with the typical naming of directories with user-facing log files.
Together with the renaming of pg_clog and pg_xlog, this should clear up
that difference.

Author: Andreas Karlsson <andreas@proxel.se>

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