[HACKERS] sync process names between ps and pg_stat_activity

The process names shown in pg_stat_activity.backend_type as of PG10 and
the process names used in the ps display are in some cases gratuitously
different, so here is a patch to make them more alike.  Of course it
could be debated in some cases which spelling was better.

As an aside, is there a reason why the archiver process is not included
in pg_stat_activity?

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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