Thank you for all of the help. Niel's posting
its your local python you need use for bin/pip (not system python)
is what helped me figure out the last bit of what I needed to do to fix my problem. While I have a lot of experience in writing and using software for my aerospace engineering work and some experience in system administration with Debian and Windows computers, I am not an expert at using or working with Python or Plone. In response to djowett, I do not use Anisble. Doing so is a bit beyond my expertise right now.
For those that are like me and could use a little more guidance, here is how I was able to install the hotfix. My instance of Plone is installed in /usr/local/Plone. It uses the version of Python installed in /usr/local/Plone/Python-2.7. Running /usr/local/Plone/Python-2.7/bin/pip list showed that I did not have the Python setuptools package installed and that I had an old version of pip installed. I fixed this by running /usr/local/Plone/Python-2.7/bin/python2.7 -m pip install --upgrade pip to update pip followed by /usr/local/Plone/Python-2.7/bin/python2.7 -m pip install setuptools. This installed setuptools version 44.1.1 on my system. After this, I was able to install the hotfix with sudo -u plone_buildout /usr/local/Plone/zeocluster/bin/buildout.
Again, thank you for all of the help. Sorry for being so long in posting what worked for me. My work and life got in the way and I was slow to commit to spending enough time to figure out how to fix my problem until today.