Tests(tox): Add dummy tests and unify test names
Tests(tox): Add dummy tests and unify test names

Add dummy tests for `MySQL-python` on Python 3
and for `mysqlclient`/`pypostgresql` on Python 2.7.

Unified test names must be structured
"python-version" - "database name" - "driver" [-w32].

These tests will be used in refactored
`.travis.yml`/`appveyor.yml`.

drnlm/sqlobject,sqlobject/sqlobject,drnlm/sqlobject,sqlobject/sqlobject