Buildbot no longer supports Python 2.7 on the Buildbot master.
ReporterBase is a base class used to implement various reporters.
It accepts a list of report generators which define what messages to issue on what events.
If generators decide that an event needs a report, then the
sendMessages function is called.
sendMessages function should be implemented by deriving classes.
(optional until Buildbot 3.0 is released, then mandatory) (a list of report generator instances) A list of report generators to manage.