[openstack|compute] added descriptions to returns blocks in the security_groups tests in hopes of trying to track down the cause of issue #2874
[rackspace|storage] made the index operator use indifferent access in order to fix issue #2881
[zerigo] Fix Invalid Excon request warning

This was triggering the warning:
`[excon][WARNING] Invalid Excon request keys: :host`

Followed by a stacktrace. Looking at [fog#2292][1] and the related
issues this seems like the right fix and seems to work fine.

[1]: https://github.com/fog/fog/pull/2292
Merge pull request #2899 from philk/zerigo_host_warning

[zerigo] Fix Invalid Excon request warning
[openstack|storage]  fixing bug metadata indifferent access implementation
Merge pull request #2898 from rackspace/metafix

[rackspace|storage] metadata now supports indifferent access
Merge pull request #2895 from rackspace/debug_openstack_tests

[openstack|compute] Add descriptions to returns blocks in the