Remaned openstack_handle.rb

renamed:    openstack_handle.rb -> openstack_handle/handle.rb
Updated openstack_handle/handle.rb
Added new openstack_handle.rb
Remainder of changes.
Changes based on code review comments.
Fixes for spec tests.
Removed the explicit setting of :allow_unused_http_interactions in spec tests.
Merge pull request #232 from roliveri/tenant_fix

OpenStack - Ensure inventory is collected for all tenants.
Update VCR to see errors disguised by "UnusedHTTPInteractionError"

VCR fixed by: https://github.com/vcr/vcr/pull/336
discussion: http://talk.manageiq.org/t/travis-vcr-cassettes-and-unused-http-interactions/97/2