As a user, I have docs on how to integrate with a LDAP server

[pulpbot]

Author: @bmbouter (bmbouter)

Redmine Issue: 8802, https://pulp.plan.io/issues/8802

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Add docs on how to configure Pulp (with examples) to connect to a LDAP installation.

This should be a new section under the new Authentication top-level portion of the docs.

Here are the notes that I worked from to get this working previously. https://hackmd.io/ED9UpscNSRW86Le3xNzVeg

[stale]

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