make neutron tests py26 compatible

the cliff framework that the quantumclient uses does not work well with python 26, since it wants to use the  itertools.compress method (not supported by itertools in py26).  This means that any of the '-c [name_of_field]' type args to quantumclient don't work properly under centos/py26.

A pull is in to fix cliff (https://github.com/dreamhost/cliff/pull/41), but this is unlikely to make it in to centos any time soon, so it's easiest to redo these tests to not use that functionality.