1129817 - prepend process id and thread id if line is split

By including a unique identifier, it is possible to separate logs that are generated at the same time.

 [Bugzilla-1129817](https://bugzilla.redhat.com/show_bug.cgi?id=1129817)
I think the below error might be happening because you are not considering the prior value of the relative_ending_index from line 198, but are just using the max_length here. If the message isn't the full length the traceback below could happen.