The added patch makes resource-retriever compatible with python3.
Also drop python-urlgrabber which resource-retriever used to
depend on.
Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>
The resource_retriever package's source was moved into
its own repository, and needs now python-urlgrabber.
Hence, this commit provides the recipe for python-urlgrabber, moves
the resource-retriever to its own location, and updates all other
packages in the robot_model repository.