Revert "[rackspace] updated shindo helper to add :rackspace_queues_client_id to credentials if it does not already exist. Hopefully this will make it easier to run Rackspace tests"

This reverts commit 6efc48d9ebe690a676e5fdeea9183a84f5e3495a.
added uuidtools gem to dependencies
[rackspace|queues] updated Fog::Rackspace::Queues to generate UUID for client id if it is not provided with one.
[core] removing uuidtools dependency; added Fog::UUID class
[rackspace|queues] updated to use FOG::UUID
Merge branch 'master' of github.com:fog/fog into uuid_queues
[core] updated UUID to use it's own UUID implementation if one was not available from the ruby lib.
Merge pull request #2247 from rackspace/uuid_queues

[rackspace] Adding Default UUID Queue Name