"postgresql/data/pg_log/postgresql-Mon.log" should not exist on gear

https://bugzilla.redhat.com/show_bug.cgi?id=1088162

After add postgresql-9.2 to a app, then check all the logs, found
"postgresql/data/pg_log/postgresql-Mon.log", and this should not exist on
gear. And the log file exist in pgdata-template.tar.gz