
As discussed in the Liberty Design Summit "Moving apps to Python 3" cross-project workshop, the way forward in the near future is to switch to the pure-python PyMySQL library as a default. Added a special test environment to keep MySQL-python support. Documentation modified. https://etherpad.openstack.org/p/liberty-cross-project-python3 Change-Id: I12b32dc097a121bd43991bc38dd4d289b65e86c1