Remove unused dependency to config module
Remove unused dependency to config module

Auth module unit tests import and mock config, which is not
needed anymore since the auth module has been made independent
from config. Cleaning up the unused dependency in preparation
to migration to tempest-lib.

Change-Id: Iedcd2fa7713409743b1b4b9f460481608796d491

Tesora/tesora-tempest,alinbalutoiu/tempest,tudorvio/tempest,varunarya10/tempest,varunarya10/tempest,afaheem88/tempest,afaheem88/tempest,yamt/tempest,LIS/lis-tempest,masayukig/tempest,redhat-cip/tempest,Juraci/tempest,jaspreetw/tempest,eggmaster/tempest,akash1808/tempest,roopali8/tempest,sebrandon1/tempest,flyingfish007/tempest,rakeshmi/tempest,dkalashnik/tempest,xbezdick/tempest,pandeyop/tempest,roopali8/tempest,redhat-cip/tempest,Juniper/tempest,tonyli71/tempest,akash1808/tempest,vedujoshi/tempest,neerja28/Tempest,vedujoshi/tempest,Tesora/tesora-tempest,neerja28/Tempest,openstack/tempest,zsoltdudas/lis-tempest,eggmaster/tempest,manasi24/jiocloud-tempest-qatempest,bigswitch/tempest,masayukig/tempest,yamt/tempest,alinbalutoiu/tempest,xbezdick/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,dkalashnik/tempest,hpcloud-mon/tempest,cisco-openstack/tempest,danielmellado/tempest,tonyli71/tempest,hayderimran7/tempest,jaspreetw/tempest,JioCloud/tempest,pandeyop/tempest,izadorozhna/tempest,pczerkas/tempest,cisco-openstack/tempest,pczerkas/tempest,sebrandon1/tempest,NexusIS/tempest,flyingfish007/tempest,nunogt/tempest,JioCloud/tempest,manasi24/tempest,tudorvio/tempest,rakeshmi/tempest,Juraci/tempest,zsoltdudas/lis-tempest,manasi24/jiocloud-tempest-qatempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,openstack/tempest,hayderimran7/tempest,danielmellado/tempest,izadorozhna/tempest,hpcloud-mon/tempest,nunogt/tempest,Juniper/tempest,manasi24/tempest,LIS/lis-tempest,bigswitch/tempest,NexusIS/tempest