Current logger calls return `true`|`false` depending whether the current level
allows the logging message or not.

In the orchestration, we happened to have the logger call as the last
call of the orchestration method (https://github.com/theforeman/foreman/blob/1.10.1/app/models/concerns/orchestration/ssh_provision.rb#L66).

When the method returns non-true value, it's considered as failure and the whole thing
tries to get rollbacked.