This patch does, basically, three things:
* Updates the default auth section to keystone_auth;
* Introduces keystoneauth sessions and plugins;
* Adds a deprecation warning and options when loading
legacy auth.
Config, tests and client code are also updated.
Co-Authored-By: Henrique Truta <henrique@lsd.ufcg.edu.br>
Co-Authored-By: Raildo Mascena <raildo@lsd.ufcg.edu.br>
Closes-Bug: 1496810
Closes-Bug: 1515014
Change-Id: I5c1cd24ca28d66ae7ae40e7f707b81870cf0e457