Allow setting PostgreSQL settings via environment variables in tests
Allow setting PostgreSQL settings via environment variables in tests

In addition to RESOLWE_POSTGRESQL_PORT, a developer can now set:
- RESOLWE_POSTGRESQL_NAME,
- RESOLWE_POSTGRESQL_USER,
- RESOLWE_POSTGRESQL_HOST.

jberci/resolwe,genialis/resolwe,genialis/resolwe,jberci/resolwe