Can't delete a minion key from the Python API

[whiteinge]

This doesn't work. No error, no return. Tested on 2015.8 and 2016.3.

>>> import salt.wheel
>>> import salt.config
>>> master_opts = salt.config.client_config('/etc/salt/master')
>>> wheel = salt.wheel.WheelClient(master_opts)
>>> wheel.cmd('key.delete', kwarg={'match': 'jerry'})

[rallytime]

@whiteinge I think this might be a duplicate of #30866. What do you think?

[rallytime]

@whiteinge I think this should be fixed with #31570.

[cro]

verified fixed.