Regenerate sample config file

The sample config file was regenerated using

 tox -r -e sample_config

Change-Id: I2e0b12369742b9fbe2ec97725e8771af64f2b2a5
Adds oslo.db support for Python 3 tests

bp python3

Change-Id: I0c1cf795c82760aa7ccbce010afca7533b351541
Merge "Adds oslo.db support for Python 3 tests"
Merge "Regenerate sample config file"