Alpha sort the nova and neutron sections.

I'm having a minor OCD moment.

Change-Id: I49cdf078d24a38dcdb1f2801764dbcbd6dd10ccf
Add metadata for the nova floating-ips extension.

Nova defaults to trying to allocate floating ips from a neutron
network called 'nova' but we called our external one ext-net (which
various Neutron documentation uses), so we need to override it or the
nova floating-ips extension isn't usable [without explicitly setting a
pool in the API calls].

Partial-Bug: #1239450
Change-Id: I1ef78642bdc1f19d25422961350e4f02a8f6c16f
Hide the AdminToken too.

This is arguably more important than passwords as it allow rooting
keystone :).

Change-Id: I12d8ae0f096480112a82d7598eedae64a6fbd861