translatable string fixes

I noticed this entry while updating the translation for 9.6:

#: catalog/index.c:3456 commands/vacuumlazy.c:1345 commands/vacuumlazy.c:1421
#: commands/vacuumlazy.c:1610 commands/vacuumlazy.c:1820
#, c-format
msgid "%s."
msgstr "%s."

All of these correspond to errdetail printing pg_rusage_show() output.
I think these are all bogus and should be changed to
errdetail_internal() instead.  Surely if we want pg_rusage_show() output
to be translated, we should apply _() to the snprintf() call inside that
function.

At the same time, trying to append a period in the callers seems
pointless; if we really feel a strong need for that period I suggest we
add a flag to pg_rusage_show() to indicate whether to add it or not,
though my inclination is not to bother.

I also attach style fixes for other issues I found.

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