* Drop gnocchi.conf from snap source in favor of installing it (as well as
api-paste.ini and policy.json) from upstream source.
* Drop gnocchi-api entry point in favor of using gnocchi-uwsgi and
gnocchi-nginx to serve API requests.
* Move to gnocchi 4.0.2 source.
* Update gnocchi-snap.conf.j2 template with $SNAP_COMMON paths.
* Add statsd and change-sack-size entry points and modify existing entry
points to use snap-openstack.
* Add test configs that enable a working gnocchi.
* Enhance test scripts and split into separate scripts.
* Bring back oslo-config-dirs.patch and upper constraints as they're
needed for ocata.
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