Fix deprecation warning.

[fog][DEPRECATION] #connection is deprecated, use #service instead (/home/rails/stronghold/vendor/bundle/ruby/2.1.0/gems/fog-1.22.1/lib/fog/openstack/models/network/floating_ips.rb:23:in `get')
Merge pull request #3312 from seanhandley/fix_deprecation_warnings

Fix deprecation warning.