Move all configuration options related to Keystone
API to [keystone] section.
This change also fixes a bug for configuring user and domain names
for Keystone API V3 protocol by allowing to define them via
a separate option.
Move the code that defines those options to
These changes are intended to re-organize code and parameters by the
functionality they perform in package and subpackages that have as less
interdependency as possible in a 'aspect oriented' approach.
This patch switches Tobiko devstack plugin to install
python 3 with helper function provided by devstack.
It is compatible with both Ubuntu and Fedora based systems.