Other install notes

[Cantor, Scott]

Couple more things I encountered:

- Are we going to configure logback to use files in idp.home/logs or do we
need more code for that still? It's using STDOUT at the moment.

- Jetty is configured to bind to localhost only, and the use of a host
property in the connectors means it will only bind to localhost or the
external interface but not both. Are we using that to avoid the tests in
jenkins opening up something that binds externally? Ideally we shouldn't
have the host property set.

-- Scott