Swift nodes don't have to be able to talk to each other on the
ansible_ssh_host, but will always have to talk on the storage_network
specified.
This will allow us to let remote or local hosts, that can't connect to
each other on the ansible_ssh_host address to still be able to sync
their rings.
In order to achieve this we set a swift_storage_address fact which then
simplifies the "ring_contents" file, to avoid performing the same logic
twice.
Change-Id: Ic1f2a915244101ad4fbbe52496dd2b991915d01d
Partially-Implements: blueprint multi-region-swift
66ccc1a260