Some fault monitoring plugins may return "inf" or "-inf" as
values due to a failure to initialize or other errors.
This patch introduces a check on whether the parse value is infinite
(or negative infinite) and rejects the data point if that is the case.
The reasoning here is: There is no possible way a value of "inf" is ever
a true measuring or even useful. Furthermore, when passed to the
performance data writers, it may be rejected by the backend and lead
to further complications.
e7381193c8