fixed create subnet call for Quantum
updated version
future proof additions and compute fixes

getNetworkURL method added
do not return from Cinder.removeVolume until removal completes
fixed createPort endpoint
assign provider subnet id to vms where applicable
comment out test arg line
allow cloud error message to bubble up to console
bugzid: 3380 determine openstack provider in consistent way
bugzid 3395: change authentication context to region_account caching level
Merge pull request #32 from daniellemayne/2013.07

2013.07 - caching fixes, remove volume and create subnet fixes, allow cloud errors to bubble up