log_error_verbosity function display

Right now, log_error_verbosity displays the source code error location
in this format:
LOCATION:  parserOpenTable, parse_relation.c:858

I think it would be clearer to add '()' next to the function name.  We
use '() to display function names in our docs and I think using '()'
would clarify the output, e.g.:
LOCATION:  parserOpenTable(), parse_relation.c:858

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
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