Unit tests check if CDM5_POSTGRESQL_SERVER exists, but then use CDMDDLBASE_POSTGRESQL_SERVER

[schuemie]

Most OHDSI testing environments don't have environmental variable CDMDDLBASE_POSTGRESQL_SERVER set. That currently leads to the unit tests failing because the tests are only skipped if CDM5_POSTGRESQL_SERVER is not set (which is set in most OHDSI testing environments)

Please change the mentions of CDM5_POSTGRESQL_SERVER here and here to CDMDDLBASE_POSTGRESQL_SERVER.