The configuration of ``worker`` can be removed for two reasons:
* In Mitaka (and onward), it is two separate parameters:
``public_workers`` and ``admin_workers`` under section
[eventlet_server], as shown in [1]. In master (Ocata),
these options were removed.
* In the preferred keystone deployment of using u/wsgi, and not
eventlet server, this setting does not really take effect - as
Apache will manage this instead of keystone.
These options can be removed. Also, removed extra EOL spaces.
[1] https://github.com/openstack/keystone/blob/stable/mitaka/etc/keystone.conf.sample#L678-L696
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