Removed concurency from Quotas.nova_update_and_delete
Removed concurency from Quotas.nova_update_and_delete

For some bug or design issue nova doesn't allow do update quotas
simultaneously for one user

To avoid fails in Rally gates remove concurency

Change-Id: I0a7fb9fbf0c415aa357a2d24d1d674e3208b4a75
Closes-Bug: #1354761

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