spec_helper: set DEFAULT_DATABASE_PORT to 1521

Having undefined DEFAULT_DATABASE_PORT env variable resulted in port 0
instead of 1521. This change is resolving that.
Merge pull request #56 from javornikolov/set-tests-default-db-port-to-1521

spec_helper: set DEFAULT_DATABASE_PORT to 1521
fix procedure object_id retrieval

In Oracle 12c (and maybe 11g) the object_id for a package
procedure is not the same in all_procedures and all_objects.