* Remove the dead code;
* Rework the test types;
* Restore the instance connectivity check;
* Rework the clustering test to support the new node addition workflow;
* Check whether a machine where MicroStack is installed has hardware
  virtualization capabilities for different architectures. If not, use
  software emulation;
  * the host model is used with KVM since the default QEMU CPU models on
    x86_64 are subject to vulnerabilities without certain CPU-specific
    features. This conflicts with being able to use live migration
    reliably across hosts with different CPUs.
* Add a default-source-ip init argument to allow controlling the source
  IP of the installation host that will be used as a control ip or
  compute ip locally.
  * used in the clustering test so that the local host IP on the
    multipass network is used as a control IP instead of the IP
    through which the default gateway is available;
  * the IP through which the default gateway is accessible is
    used as a fallback for default-source-ip;
* Given upstream CI has a low amount of resources allocated per machine
  use LXD to set up a dummy compute node;
  * Set RLIMIT_MEMLOCK to 'unlimited' in the LXD container profile
    (see the discussion in LP: #1906280);
  * set remember_owner to 0 in qemu.conf for libvirt to avoid the
    uses of XATTRS (the root user is used anyway so there is no
    need to remember a file owner), otherwise libvirt errors out
    in an unprivileged LXD container.
* Use numeric versions of OpenStack packages in the python-packages
  section of the openstack-projects part since the resolver change in
  recent versions of pip disallows for constraints dependencies of
  packages that come from a URL or a path.
  https://github.com/pypa/pip/issues/8210
  * The newest released version of pip is always used during builds
    since snapcraft uses venv to set up virtual environments and the
    ensurepip package is invoked such that a pip version shipped with
    the distro version of python is upgraded:
    https://github.com/python/cpython/blob/3.8/Lib/venv/__init__.py#L282-L289
            cmd = [context.env_exe, '-Im', 'ensurepip', '--upgrade',
                                                    '--default-pip']
  * Environment variables are ignored when pip is installed in the venv:
    https://docs.python.org/3/using/cmdline.html#id2 (-I option)
    So there is no way to use the old pip version resolver.

Minor clustering client and add-compute changes:

* use stderr for diagnostic messages;
* use stdout to output the connection string so that it can be easily
  picked up by CLI tools without parsing.

Change-Id: I5cb3872c5d142c34da2c8b073652c67021d9ef55

Ported basic-test.sh to test_basic.py, and folded in
test_horizonlogin.py.

Made a testing framework for shared components.

Added test_control.py

Got rid of default .stestr.conf, as we're going to have multiple tests
running, and one conf is confusing.

Manually ordering functional tests for now, as stestr noms too much
output, and runs things in parallel, which doesn't work for our
functional tests.

Skipping compute node test for now, as it won't work until we can
connect to a control node with databases and such.

Moved very-basic-test.sh to tools/make-a-microstack.sh. It's really
more of a tool for manual testing than an automated test.

Added test-requirements and updated gitignore.

Moved auto-detection of kvm extensions to init, rather than test, as
it makes more sense there.

Change-Id: Iba7f7fe07cbb066790f802cf2a7c87c68994062c

Port the python2.7 local settings overrides to the python3.6 directory
structure.

Move all local_settings.py overrides into _05_snap_tweaks.py as part
of troubleshooting some remaining problems. Everything is more
organized and functional now :-)

Added selenium tests.

Change-Id: I54923e1dc9c7ffa47c2ef6fb90ea9d224b0d2eee

Tweaked tests/basic_test.sh functional test so that it no longer
requires multpass, and can run without kvm cpu extensions being
enabled (not all machines in the game have cpu extensions.)

Added tox.ini, wrapper script for building and installation, etc.

Change-Id: I968116dd7bec412a55813c896d60cfc86c7070db