enable H237 check
enable H237 check

Remove the remove use of 'new' module by properly patching the instance
object.  Additionally, enable the H237 (module is removed in Python 3) check

Change-Id: I7407600478de218a4294c4bfd774cd4cf7e1741e
Partial-Bug: 1329017

gotostack/neutron-lbaas,gandelman-a/neutron-lbaas,gotostack/neutron-lbaas,gotostack/neutron-lbaas,gandelman-a/neutron-lbaas,dougwig/x-neutron-lbaas,citrix-openstack-build/neutron-lbaas,gandelman-a/neutron-lbaas