Adds a new poll extension to provide get_hardware_info and get_node_info
interfaces.

get_hardware_info will be used for node validation by ironic deploy
drivers.

get_node_info will be used for sending lookup data to IPA.

standalone mode is assumed as debug only, but it's not the case
considering the poll mode will be introduced, slightly updates the
description, also prevents the mdns lookup when standalone is true.

Story: 1526486
Task: 28724

Change-Id: I5ad772a18cc4584585c5a7b6fb127547cece1998

Now that we are running the Victoria tests that include a
voting py38, we can now add the Python 3.8 metadata to the
package information to reflect that support.

Change-Id: I7631fe14a812624e9d8d0a1946ffb5b0f6dec893
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

Mostly adaptation of cleaning methods.

Co-Authored-By: Dmitry Tantsur <dtantsur@redhat.com>
Change-Id: Ife0502391bbece46d619a20a825dfdb191d5c2b4
Story: 2006963
Task: 37791

Make a few cleanups:
- Remove python 2.7 stanza from setup.py
- Add requires on python >= 3.6 to setup.cfg so that pypi and pip
  know about the requirement
- Remove obsolete sections from setup.cfg:
  * Wheel is not needed for python 3 only repo
  * Some other sections are obsolete
- Update classifiers
- Update requirements, no need for python_version anymore
- Use sphinx-build

Change-Id: I8abd764d97a6711d3e6347ec3a7b8967f1512006

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

ironic-python-agent 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: Ifd0e0b99bb82a7d7e82d6c14309468196f5734fc

Change-Id: I64e66682c1e54f6edc260a22f46f5f6df8e85af1
Story: 2005896
Task: 33756

This is a mechanically generated patch to ensure unit testing is in place
for all of the Tested Runtimes for Train.

See the Train python3-updates goal document for details:
https://governance.openstack.org/tc/goals/train/python3-updates.html

Change-Id: I409d9e3db05eaf11ccaaaef8784d693f40687328
Story: #2005924
Task: #34213

Change-Id: I7bad0c5799be2cc550efee20507e882ed055cc9a