Removing config values no longer in tempest.conf
Removing config values no longer in tempest.conf

This commit removes some config values for tempest that no
longer exist in tempest/config.py therefore are no longer needed
in tempest.conf.

Change-Id: I5778973012e57e8d9df9bf864590f8ed7fe05561

richliu/devstack,openstack-dev/devstack,nawawi/openstack,richliu/devstack,group-policy/devstack,bswartz/devstack,noironetworks/devstack,openstack-dev/devstack,dtroyer/devstack,dtroyer/devstack,group-policy/devstack,nawawi/openstack,bswartz/devstack,noironetworks/devstack