Delete the useless code
Delete the useless code

These lines of code are not used anywhere, and we already have a
command "gnocchi resource-type list".

Change-Id: Ia14f4da3bb6d2bdf19b8cb0efc2df9c7adbe68a8

sileht/python-gnocchiclient,gnocchixyz/python-gnocchiclient,gnocchixyz/python-gnocchiclient