Remove no longer needed neutron helper

This was only needed because:
a) we didn't stamp the neutron db in Cloud 3 correctly
b) the migrations that neutron executed where depending on which plugins are
   enabled. This is no longer the case with Juno.
Merge pull request #24 from rhafer/cleanup

Remove no longer needed neutron helper
Merge remote-tracking branch 'upstream/master' into bugfix-step1

asdid