Fix too slow .VirshProviderTestCase.test_create_vm
Fix too slow .VirshProviderTestCase.test_create_vm

We should mock time.sleep() method.

Change-Id: I2b919f7e70e866209612efd0bf31e4b9a5c4180b
Closes-Bug: #1259248

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