Performance changes for UTs
Performance changes for UTs

Mocks unit test sleep to return immediately mitigating any unit test
sleep time taken for the cleanup tests.

Change-Id: I16aead4bbeeb5e90740f6b9bddcff627c8a33cc2

varunarya10/rally,go-bears/rally,gluke77/rally,gluke77/rally,redhat-openstack/rally,redhat-openstack/rally,vganapath/rally,openstack/rally,yeming233/rally,group-policy/rally,pyKun/rally,vefimova/rally,vponomaryov/rally,yeming233/rally,ytsarev/rally,go-bears/rally,pyKun/rally,paboldin/rally,vponomaryov/rally,eonpatapon/rally,paboldin/rally,eayunstack/rally,amit0701/rally,group-policy/rally,gluke77/rally,eayunstack/rally,amit0701/rally,openstack/rally,vefimova/rally,pandeyop/rally,shdowofdeath/rally,aplanas/rally,aplanas/rally,openstack/rally,vganapath/rally,vganapath/rally,eonpatapon/rally,cernops/rally,cernops/rally,vganapath/rally,aforalee/RRally,group-policy/rally,eayunstack/rally,afaheem88/rally,openstack/rally,pandeyop/rally,ytsarev/rally,paboldin/rally,amit0701/rally,aforalee/RRally,afaheem88/rally,varunarya10/rally,gluke77/rally,shdowofdeath/rally