[testlib] put postgres test database in test/data/database directory
with other (sqlite) test databases. Closes #9240765
Simplify .hgignore in passing.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')