This patch is a sample oslo.metrics code to gather oslo.messaging's
metrics and export the metrics to prometheus. Some parts of this code
doesn't follow OpenStack standards style, and this lacks test codes.
Please use this patch as PoC for oslo.metrics.

Co-Authored-By: Yuki Nishiwaki <yuki.nishiwaki@linecorp.com>
Change-Id: I9434d11466e7626fdbebd1340a8bb3d664518bd1

Trivial change to README.rst to test GitHub replication on
newly-created repositories.

Change-Id: I6c0c5dee72bd3e09a0988bcda0d1465519527aca

Add date for expected initial code drop, to test GitHub
replication.

Change-Id: Ic88431f7362bbee54afba93c85e12b6a8fd2541e

Push minimal LICENSE ane README.rst, while waiting for the
initial code drop.

This will allow to test that everything is ready.

Change-Id: I3eaf35e929cf9af3778e686c654fa392b019c171