Fixed attribute passing for add_interface

Server model has an `add_interface` method. This method allows attributes to be passed so you can configure options on the interface. Unfortunately it doesn't pass these options to the create_interface call. This in turn leaves `attributes` empty for `create_vm.rb#create_interface` and subsequently `create_vm.rb#create_nic_backing`. When you define a `DistributedVirtualPortgroup` as the network attribute, and `create_nic_backing` doesn't have `attributes[:datacenter]`, you will end up with a newly created StandardPortgroup instead of the correct `DistributedVirtualPortgroup` in your Backing info for the interface. To solve this you will need to pass along the `datacenter: 'name-your-dc-here'` param when you call server.add_interface, along with `type`, and `network`. 

Tested in ESX 5.5
Adds openstack_region parameter to OpenStack Identity Service
Found a typo in the Changelog

typo!
Merge pull request #3192 from jjasghar/typo_in_changelog

Found a typo in the Changelog
Raise docker-api errors up
explicitly load version info, now that core no longer implicitly does
Merge pull request #3193 from eLobato/fogdocker-errors

Raise docker-api errors up
bump fog-core dep, cleanup user-agent expectation
Revert "explicitly load version info, now that core no longer implicitly does"

This reverts commit 2c6f59504699ef24d594fecfa76b7532388e0515.
nuke core/connection tests (duplicates tests now in fog-core)
Merge tag 'v1.24.0' into patch-1

Catching up with v1.24.0
[google|dns] Add Project resource

- Add Project models, requests and tests
[google|dns] Add Zone model

- Add Zone model and test
- Refactor zone mock request to use a single Hash
- create_managed_zone requires description, don't default it to blank
- Fix indentation
[google|dns] Add Record resource

- Add Record models, requests and tests
- Add #record method (and associated test) to Zone
[google|dns] Add Change resource

- Add Change models, requests and tests
- Add #changes method (and associated test) to Zone
- Add #destroy method (and associated test) to Zone
- Add #modify method (and associated test) to Zone
- Add #save method (and associated test) to Zone
[google|dns] Add examples
added support for searching of images in fogdocker
Merge pull request #3196 from witlessbird/docker-image-search

added support for searching of images in fogdocker
Added GovCloud region to acceptable AWS list
Merge pull request #3195 from frodenas/gce_dns

[google|dns] Add missing models, requests and tests