Implements Nova FloatingIP resources

    https://blueprints.launchpad.net/heat/+spec/nova-networking-floatingip

This code aims to add support OS::Nova::FloatingIP
and OS::Nova::FloatingIPAssociation in Heat.

Change-Id: I678f8a099b97c0fb46bf1056203fc9bafe3032aa
Implements: blueprint nova-networking-floatingip
Fix showing events on swift.

We don't need to auth again since we already have a valid preauthurl and
preauthtoken already.

Change-Id: Ic48b1bfccaef8f47b46fffb5a014a05b0ce37a9c
Closes-Bug: 1263799
Merge "Implements Nova FloatingIP resources"
Merge "Fix showing events on swift."