Removing initialization of clients that are not used
Removing initialization of clients that are not used

Removing initialization of some clients from BaseIdentityV3Test class
because they are not used anywhere.

Change-Id: I5fa6ad44cec2741440b4a72b3a455fe1c4d2e932

openstack/tempest,cisco-openstack/tempest,sebrandon1/tempest,openstack/tempest,Juniper/tempest,bigswitch/tempest,LIS/lis-tempest,zsoltdudas/lis-tempest,Tesora/tesora-tempest,cisco-openstack/tempest,zsoltdudas/lis-tempest,bigswitch/tempest,Tesora/tesora-tempest,masayukig/tempest,vedujoshi/tempest,masayukig/tempest,Juniper/tempest,LIS/lis-tempest,sebrandon1/tempest,vedujoshi/tempest