Allows multiple reports per a patchset to be sent to pluggable
destinations. These are configurable per pipeline and, if not
specified, defaults to the legacy behaviour of reporting back only
to gerrit.
Having multiple reporting methods means only certain success/failure
/start parameters will apply to certain reporters. Reporters are
listed as keys under each of those actions.
This means that each key under success/failure/start is a reporter and the
dictionaries under those are sent to the reporter to deal with.
Change-Id: I80d7539772e1485d5880132f22e55751b25ec198