Fixed testDbPostgresql unit test to support schema.
Fixed testDbPostgresql unit test to support schema.

Signed-off-by: Rack Lin <4316f05055309cf237e0fde316dbde39db851065@gmail.com>

unisys12/phalcon-hhvm,Zaszczyk/cphalcon,unisys12/phalcon-hhvm,unisys12/phalcon-hhvm,unisys12/phalcon-hhvm,Zaszczyk/cphalcon,Zaszczyk/cphalcon,Zaszczyk/cphalcon,unisys12/phalcon-hhvm,unisys12/phalcon-hhvm