Using the neutron context from neutron_lib (but
continues using db_api from neutron instead of
neutron_lib).
Note that Neutron still uses the context from the Neutron
repo in Ocata, so with this patch, both, Neutron and
neutron_lib, contexts will be in play depending on
whether the context is being instantiated by Neutron
or by GBP.
Also updating the tox hacking ignores to not require
translation hints for log messages. This should have been
removed in the previously merged patch which removed the log
message hints.
Change-Id: I8df4d00a8c0109e04e1f72576a54048332666078
bd645a073d