filter_parser: Add emit_invalid_record_to_error parameter

[repeatedly]

Related to #1480
This is acceptable for me because configuration becomes error prone without this parameter for ignoring unneeded log lines case.

<label @ERROR>
  <match {tag1,tag2,...}>
    @type null
  </match>
</label>

@ERROR label is for capturing unexpected error event so blackhoke usecase is misuse.

Parameter name comes from v0.12's filter_parser.

[repeatedly]

@tagomoris Could you check this?

[repeatedly]

@tagomoris ping?

[tagomoris]

No need to call router.emit_error_event by itself.
Filter#filter_stream emits events with errors in default.
So this code should only raise errors:
https://github.com/fluent/fluentd/blob/master/lib/fluent/plugin/filter.rb#L55

[repeatedly]

Use raise when no emit case.
With reserve_data true, filter_parser passes incoming data to next filter so can't use raise.

[tagomoris]

LGTM.