Fix bad entry points in setup.cfg
Fix bad entry points in setup.cfg

There are defined entrypoints that do not exist in the code base,
these result in `Could not load EntryPoint.parse` errors when
doing `openstack --help`.

Closes-Bug: 1597788
Change-Id: Ia28acdad53e31e43217933b5f77bf2c6d419fc2e

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