Changed cookbook name to openstack-identity

Changed the cookbook to opentack-identity.  This involved changing
many attribute and lwrp references.  Also, corrected tests to use
the new cookbook name and attributes.

All tests are passing.

Change-Id: Idcc49431c9c9327066deaed520ceb82b86db3ea8
Attributes for the Identity service are now in the ['openstack']['identity'] namespace.

Change-Id: Ifc03190e6318054026d4b0e17aaefb1809fa586e
Make identity providers use uri_join_paths

Instead of defining the same _path function in each of these providers,
I have moved it to uri_join_paths in openstack-common. This change
simply makes use of that new function.

All tests pass.

Change-Id: Ie821d4210f1a34f6aa9f259d8b591f95c6304485
Merge "Make identity providers use uri_join_paths"
add keystone register support for metering(ceilometer) service

Change-Id: I3bfb6a569fa7b4eda8bd8fb970c725fbe4379c99