Relation addresses

[Andrew Wilkins]

Hi all,

I've started looking into fixing
https://bugs.launchpad.net/juju-core/+bug/1215579. The gist is, we
currently set private-address in relation settings when a unit joins, but
never update it.

I've had some preliminary discussions with John, William and Dimiter, and
came up with the following proposal:
https://docs.google.com/a/canonical.com/document/d/1jCNvS7sSMZqtSnup9rDo3b2Wwgs57NimqMorXr9Ir-o/edit

If you're a charm author, particularly if you work on "proxy charms",
please take a look at this and let me know of any concerns or suggestions.
I have opened up comments on the doc.

In a nutshell:
 - There will be a new hook, relation-address-changed, and a new tool
called address-get.
 - The hook will be called when the relation's address has changed, and the
tool can be called to obtain the address. If the hook is not implemented,
the private-address setting will be updated. Otherwise it is down to you to
decide how you want to react to address changs (e.g. for proxy charms,
probably just don't do anything.)

Thanks,
Andrew
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