Keystone in default devstack installation runs as a uwsgi process
which isn't using ports 5000 and 35357. Instead it uses aliases bind
to default http port.
Set up keystone installation to runs as wsgi which uses default ports
that are used by monasca components.
Change tempest tests configuration to work with
keystone deployed in uwsgi mode.
Remove custom tempest.conf file. Using configure_auth_token_middleware
for monasca-api configuration file and use openrc to generate
environmental variables.
Story: 2000995
Task: 4173
Change-Id: I337609a471a8ee8e350e149df9e9d7924a730f57
e366823ac5