Remove not used server creation from test_server_rescue
Remove not used server creation from test_server_rescue

test_server_rescue created a server in the setUpClass
 which is not in use in the current code base.

Change-Id: I9487ddf6db8fda5b5fe6aa3f8787b56b8c865cf5

akash1808/tempest,izadorozhna/tempest,zsoltdudas/lis-tempest,Lilywei123/tempest,afaheem88/tempest_neutron,pandeyop/tempest,varunarya10/tempest,pczerkas/tempest,hpcloud-mon/tempest,nunogt/tempest,hayderimran7/tempest,Tesora/tesora-tempest,sebrandon1/tempest,rzarzynski/tempest,flyingfish007/tempest,roopali8/tempest,sebrandon1/tempest,jaspreetw/tempest,neerja28/Tempest,vedujoshi/tempest,Vaidyanath/tempest,alinbalutoiu/tempest,Vaidyanath/tempest,neerja28/Tempest,masayukig/tempest,manasi24/tempest,JioCloud/tempest,cloudbase/lis-tempest,redhat-cip/tempest,yamt/tempest,afaheem88/tempest,openstack/tempest,yamt/tempest,Tesora/tesora-tempest,tonyli71/tempest,afaheem88/tempest,eggmaster/tempest,NexusIS/tempest,rakeshmi/tempest,tudorvio/tempest,eggmaster/tempest,akash1808/tempest,openstack/tempest,NexusIS/tempest,hayderimran7/tempest,dkalashnik/tempest,afaheem88/tempest_neutron,FujitsuEnablingSoftwareTechnologyGmbH/tempest,zsoltdudas/lis-tempest,LIS/lis-tempest,ebagdasa/tempest,Juraci/tempest,tonyli71/tempest,Juniper/tempest,cisco-openstack/tempest,flyingfish007/tempest,manasi24/tempest,CiscoSystems/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,danielmellado/tempest,pandeyop/tempest,izadorozhna/tempest,jaspreetw/tempest,redhat-cip/tempest,Lilywei123/tempest,pczerkas/tempest,JioCloud/tempest,queria/my-tempest,roopali8/tempest,nunogt/tempest,cisco-openstack/tempest,xbezdick/tempest,danielmellado/tempest,manasi24/jiocloud-tempest-qatempest,ebagdasa/tempest,hpcloud-mon/tempest,bigswitch/tempest,alinbalutoiu/tempest,xbezdick/tempest,jamielennox/tempest,bigswitch/tempest,varunarya10/tempest,rzarzynski/tempest,rakeshmi/tempest,cloudbase/lis-tempest,tudorvio/tempest,CiscoSystems/tempest,LIS/lis-tempest,dkalashnik/tempest,vedujoshi/tempest,Juniper/tempest,jamielennox/tempest,queria/my-tempest,Juraci/tempest,manasi24/jiocloud-tempest-qatempest,masayukig/tempest