LDAP Support

[nniehoff]

Provide a method in the helm charts to configure LDAP with Nautobot.

[nniehoff]

Technically this could be achieved today with a custom image (to install the ldap dependencies) and custom nautobot_config.py. With the implementation of nautobot/nautobot#1073 we will no longer need a separate image. However, the default nautobot_config.py does not currently contain ldap config settings. I would suggest we get them added there to pull from the env and the helm chart just utilize those settings.

[gertzakis]

If issue 6234 of Nautobot is accepted and implemented. We won't need to update the whole nautobot_config.py file and could easily support LDAP through environmental variables.