Added the django-request-logging package to mailman-web to assist when
necessary with debugging by being able to easily log the requests
recevied by the mailman-web service.

Updated the Mailman 3 for COmanage Registry images to
version 0.2.3 to pick up more recent version of
core (3.2.2), postorious (1.2.4), and hyperkitty (1.2.2).

Update the Mailman 3 images and service deployment scripts so
that Apache HTTP Server with the Shibboleth SP serves as the
web proxy so that the Mailman 3 UI interfaces (Postorius and
Hyperkitty) are protected with SAML.

Changes necessary to ingegrate COmanage Registry with Mailman 3.2.0.

Updated Mailman 3 Web Dockerfile to pin version numbers for various
django- modules. Updated settings.py configuration to remove all
social login providers. Updated login template file to remove links
to social providers.

First commit of Mailman3 with REST API extensions needed for
provisioning from COmanage.