This is a combination of two patches that depend on
each other to fix a breakage with PyMySQL 0.10.0 and
fixing the up the CI to a working state.
1. Blacklist etcd3gw 0.2.6
etcd3gw 0.2.6 was blacklisted in openstack/requirements [0], because
that version has a bug [1].
tooz does not use openstack/requirements' upper constraints, so the
same blacklisting needs to be introduced here in setup.cfg.
[0] Icb6873d8c5d3a3624c0ac3d76fc9125c5d8134b2
[1] https://github.com/dims/etcd3-gateway/issues/41
Change-Id: I22b955419014dd34c63e406c488e0636ffe9013b
Closes-Bug: #1891314
(cherry picked from commit 3f0759091c9fddf4d1486188015fc526e66cd73e)
(cherry picked from commit c8d77ee485746c4367528e542063d5a045c4b6f3)
2. Fix breakage with PyMySQL 0.10.0
In this version a Connection is no longer a context manager. Fix
it by simply getting a Cursor out of it (locks don't seem to
interact with transactions, at least according to MariaDB docs).
Change-Id: I5ea06ebd2b976465ff82f10a74e140f30e9e803f
(cherry picked from commit d59b283440e96959e6ad1b9ce2aa154c31e71480)
667e2ec1f4