psql: Add variable SERVICEFILE

This new psql variable can be used to check which service file has been
used for a connection.  Like other variables, this can be set in a
PROMPT or reported by an \echo, like these commands:
\echo :SERVICEFILE
\set PROMPT1 '=(%:SERVICEFILE:)%# '

This relies on commits 092f3c63efc6 and fef6da9e9c87 to retrieve this
information from the connection's PQconninfoOption.

Author: Ryo Kanbayashi <kanbayashi....@gmail.com>
Discussion: 
https://postgr.es/m/cakkg4_ncjx3a_f3gyxhspwxd8sd8uram89wey7fg_9g7kbk...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/6b1c4d326b064bf0eaedccb08a7fcca5db5d9629

Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml | 9 +++++++++
src/bin/psql/command.c         | 7 +++++++
2 files changed, 16 insertions(+)

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