Remove cinder volume type deletion
Remove cinder volume type deletion

Rally doesn't currently create cinder volume types, so shouldn't blindly
remove all existing types. Also the remove function doesn't actually
work.

Change-Id: I10ece87994578cd3b48ec37864cfda01fb8cda9b
Closes-Bug: #1286129

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