enable worker is deprecated but not start without enabling

[Eduardo Gonzalez]

Using centos, source code from master.

Having worker enabled I'm having deprecation messages:

[service:worker]
enabled = True
notify = True

2017-03-28 11:35:25.754 5 WARNING oslo_reports.guru_meditation_report [-] Guru meditation now registers SIGUSR1 and SIGUSR2 by default for backward compatibility. SIGUSR1 will no longer be registered in a future release, so please use SIGUSR2 to generate reports.
2017-03-28 11:35:25.754 5 WARNING oslo_config.cfg [-] Option "enabled" from group "service:worker" is deprecated for removal. Its value may be silently ignored in the future.

If I remove enabled option, designate-worker service fails to start.

[service:worker]
notify = True

2017-03-28 11:31:15.832 5 ERROR designate.cmd.worker [-] You do not have designate-worker enabled, starting designate-worker is not allowed. You need to start designate-pool-manager instead.
2017-03-28 11:31:20.969 5 WARNING oslo_reports.guru_meditation_report [-] Guru meditation now registers SIGUSR1 and SIGUSR2 by default for backward compatibility. SIGUSR1 will no longer be registered in a future release, so please use SIGUSR2 to generate reports.
2017-03-28 11:31:20.970 5 ERROR designate.cmd.worker [-] You do not have designate-worker enabled, starting designate-worker is not allowed. You need to start designate-pool-manager instead.

[Tim Simmons (timsim)]

This is correct, the string is a little bit confusing, even though it's deprecated because we don't want to need this thing soon, it's still needed. Maybe update the string to be more clear?

[Erik Olof Gunnar Andersson (eandersson)]

This was fixed in Stein when the worker was enabled by default. It will however still log the deprecated warning if enabled is set in the configuration, but that is no longer required for the worker to function.