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)
You might make mention of this new functionality here, in particular that the cutting is not also dependent on whether a message ID is being inserted.

Also, make sure you add the new parameters to the docblock below.