@Override
    public Boolean startJob(final String jobName) {
        modifyJob(jobName, true);
        return Boolean.TRUE;
    }
Sets the command flag to start a job with this name on all nodes in the
cluster.

@param jobName The name of the job to start.
@return True if successful.
stroom-job/stroom-job-impl/src/main/java/stroom/job/impl/JobManagerImpl.java