1099954 - Link installation docs to using Pulp with SASL and Qpid docs

https://bugzilla.redhat.com/show_bug.cgi?id=1099954

This PR is the second PR for this BZ. The first PR [1204](https://github.com/pulp/pulp/pull/1204) is against 2.5-testing. These changes are in a separate PR because the docs I wanted to edit weren't introduced until 2.5-dev.