Openstack methods assume the extension for floating IP's is loaded

[plribeiro3000]

trafficstars

server.public_ip_address and server.private_ip_address fail when executed against an Openstack implementation without the floating-ip extension loaded. I'm not sure how common this is, but Rackspace does it. While fog has a separate Rackspace provider, other small openstack implementations may follow their lead on config options.

Stacktraces:

irb(main):006:0> server.public_ip_address
Fog::Compute::OpenStack::NotFound: Fog::Compute::OpenStack::NotFound
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/middlewares/expects.rb:10:in `response_call'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/middlewares/response_parser.rb:8:in `response_call'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/connection.rb:349:in `response'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/connection.rb:247:in `request'
from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/core/connection.rb:57:in `request'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/core/deprecated/connection.rb:20:in `request'
   from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/compute.rb:339:in `request'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/requests/compute/list_all_addresses.rb:10:in `list_all_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:95:in `all_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:110:in `floating_ip_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:116:in `floating_ip_address'
    from (irb):6
    from /usr/local/bin/irb:12:in `<main>'

irb(main):007:0> server.private_ip_address
Fog::Compute::OpenStack::NotFound: Fog::Compute::OpenStack::NotFound
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/middlewares/expects.rb:10:in `response_call'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/middlewares/response_parser.rb:8:in `response_call'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/connection.rb:349:in `response'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/excon-0.25.3/lib/excon/connection.rb:247:in `request'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/core/connection.rb:57:in `request'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/core/deprecated/connection.rb:20:in `request'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/compute.rb:339:in `request'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/requests/compute/list_all_addresses.rb:10:in `list_all_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:95:in `all_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:110:in `floating_ip_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:122:in `private_ip_addresses'
    from /usr/local/Cellar/ruby/1.9.3-p392/lib/ruby/gems/1.9.1/gems/fog-1.15.0/lib/fog/openstack/models/compute/server.rb:126:in `private_ip_address'
    from (irb):7
    from /usr/local/bin/irb:12:in `<main>'

This was discovered while testing kitchen-openstack: https://github.com/RoboticCheese/kitchen-openstack/issues/16

Original issue opened by @mikelococo at fog/fog#2160.

[plribeiro3000]

cc/ @geemus @krames @RoboticCheese @mikelococo @gshively11 @wolf31o2 @fifieldt