The __future__ module [1] was used in this context to ensure compatibility
between python 2 and python 3.

We previously dropped the support of python 2.7 [2] and now we only support
python 3 so we don't need to continue to use this module and the imports
listed below.

Imports commonly used and their related PEPs:
- `division` is related to PEP 238 [3]
- `print_function` is related to PEP 3105 [4]
- `unicode_literals` is related to PEP 3112 [5]
- `with_statement` is related to PEP 343 [6]
- `absolute_import` is related to PEP 328 [7]

[1] https://docs.python.org/3/library/__future__.html
[2] https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html
[3] https://www.python.org/dev/peps/pep-0238
[4] https://www.python.org/dev/peps/pep-3105
[5] https://www.python.org/dev/peps/pep-3112
[6] https://www.python.org/dev/peps/pep-0343
[7] https://www.python.org/dev/peps/pep-0328

Change-Id: Id785793c36b3a6819a7522525252c3fef15ebe2b

5a1513244caf7acbd41e181419bc8b62bf4bcaba added the ability to
filter by AZ, but it changed the existing behavior if is_public
was not specified. This adds handling to make sure we are still
consistent with the previous behavior.

Co-Authored-by: Alan Bishop <abishop@redhat.com>
Change-Id: I5000aab092c1b434c8dc17bbe4b2d3d632f528c3
Closes-bug: #1778055

This provides enough info to understand why this assertion
is failing without having to attach a debugger.

Change-Id: Ib042039d7589e7c86502ac15773fce995ff64bb9

Adjusted conditional statements to use instanceof when
comparing variables. Instanceof supports inheritance type
checking better than type.

Change-Id: I449f3df92b3646c384de717b7d53f7f85258c449

This is the first step of moving functional testing
into the project tree.  This change just moves
all of the unit tests to be under a dedicated tests/unit
directory.

Follow up patches will add the functional directory and
start moving tempest CLI tests there.

Change-Id: I9dc0b8f761676c1b3bbdeb03e2f44b35f75c693e