salt/client/raet/__init__.py: fix spacing per pylint

************* Module salt.client.raet.__init__
salt/client/raet/__init__.py:56: [C0326(bad-whitespace), ] No space allowed around keyword argument assignment
                name = 'client' + yid,
Merge pull request #13228 from cvrebert/patch-1

salt/client/raet/__init__.py: fix spacing per pylint