This change adds support for copy-image import method which will
copy existing images into multiple stores.

Change-Id: I748a8fb3dbaf9c2e4d887a2ecd4325e27a8429c4
bp: copy-image-multiple-stores

This change adds support for providing multiple target
stores where image can be imported.

Co-authored-by: Erno Kuvaja <jokke@usr.fi>
Co-authored-by: Abhishek Kekane <akekane@redhat.com>

bp: import-multi-stores
Change-Id: I8730364263f1afd5d11fd56939851bda73a892bb

Even after dropping support for py2, tempest-full job is still running
using python2.

Removed this job from the set of templates.

Change-Id: If37a91a4a362f37f396c161b980a2db20838fe3b

OpenStack is dropping the py2.7 support in ussuri cycle.

python-glanceclient is ready with python 3 and ok to drop the
python 2.7 support.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal - https://review.opendev.org/#/c/691178/

Change-Id: I029d10a2860c5ba371ff9c5df9b7e2c645a7dfbb

Currently, we are overriding 'install_command' to use 'pip'. This is
considered poor behavior and 'python -m pip' should be used instead:

https://snarky.ca/why-you-should-use-python-m-pip/

It turns out that this is the the default value provided by tox:

https://tox.readthedocs.io/en/latest/config.html#conf-install_command

So we can remove the line and simply use the default value.

Change-Id: Idd3d92657a7c17370afc0d0c35cc4666025ab9d6

Add file to the reno documentation build to show release notes for
stable/train.

Use pbr instruction to increment the minor version number
automatically so that master versions are higher than the versions on
stable/train.

Change-Id: I21107acca89fe8666e0981e1d7a6de62331b55f6
Sem-Ver: feature

Change-Id: Ib5cc95d4faad4847297c62ed6943dbc357a64234