The keystone doesn't use 5000 port anymore from Newton version. And all
the references should be changed together.
Change-Id: I3f02686ab5b3abf48f129fde92e90427ca148317
This commit also moves descriptions of settings defined in openstack_auth
from openstack_dashboard/settings.py and local_settings.py(.example)
to openstack_auth/settings.py.
Note that if openstack_dashboard has different default settings
from openstack_auth defaults, they are now moved to
openstack_dashboard/defaults.py.
Part of blueprint ini-based-configuration
Change-Id: I59eebc388de0bcbd4d1fe35c6138efbd3e04c5b8