Reads flow output plugin log entries.

def ReadFlowOutputPluginLogEntries(self,
                                     client_id,
                                     flow_id,
                                     output_plugin_id,
                                     offset,
                                     count,
                                     with_type=None):
    """Reads flow output plugin log entries."""
    entries = sorted(
        self.flow_output_plugin_log_entries.get((client_id, flow_id), []),
        key=lambda e: e.timestamp)

    entries = [e for e in entries if e.output_plugin_id == output_plugin_id]

    if with_type is not None:
      entries = [e for e in entries if e.log_entry_type == with_type]

    return entries[offset:offset + count]