pgsql: libpq: issue clear error message for nested service files

libpq: issue clear error message for nested service files

Previously an odd error message was generated. Nested service files are
not supported.

Report by David Johnston

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/90a8b1f82b826ebe18a70e47dec3b342d7fcd8d9

Modified Files
--------------
src/interfaces/libpq/fe-connect.c | 10 ++++++++++
1 file changed, 10 insertions(+)

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