watch: use current Gnocchi upstream repository

See merge request !1

Gnocchi moved out of OpenStack project in 2017.

http://lists.openstack.org/pipermail/openstack-dev/2017-March/114300.html

  * Fixed (build-)depends for this release.

gnocchi 4.3.1

(cherry picked from commit 5d412f61)

This is specific to the REST API.

This is very specific to the API

This from the old Zuul gate.

Mehdi Abaakouk authored Jul 19, 2018 and Julien Danjou committed Jul 20, 2018

Regex must start be ^ now.

The iteration over the results was wrongly computed and did not return data for
the second metric and following.

incoming data isn't that large but if we don't need to build a list
why build it.

Add notes about open source Go SDK implementation for the Gnocchi API
with links and installation instruction.

support ability to groupby year, half, quarter, month, and week.

If no resource_id or no metric names are passed in the batch payload,
we can skip some sql queries.

This change does that.

Closes-bug: #911

remove workaround... or we can hit revert on original

Use rebase strategy to merge PR

redis: use hiredis parser