Re: Plug-in common/logging.h with vacuumlo and oid2name

Patch looks good to me, please push.

Generally speaking I find the 'progname' handling a bit silly (since we
have it both as a variable in each program and also in logging.c
separately), but that's not the fault of this patch, and this patch
doesn't make it worse.  That said, I think some other messages in
vacuumlo can be made pg_log_somelevel(), based on occurrences of
'progname'.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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