Rename "floating_network" to the "floating_ip_network".
Return old "floating_ip_pool" parameter for backward compatibility with
old configuration files. It's value will be passed to the
"floating_ip_network" parameter.
This commit allows user to use the Block Storage v3 volume as the
Compute instance root volume.
Also it adds new volume-related parameters to the builder.
This change adds base support for an openstack builder.
Thank you to Rackspace for providing cloud assets to complete this work
and @sam-falvo for working with us on the perigee/gophercloud changes.