The config option "fatal_exception_format_errors" got introduced purely
for testing purposes with commit 2e80b297. This isn't an option the ops
would change from it's default value.
This change deprecates the option. When this option gets removed in the
future, we can hardcode that wrong formats should be fatal by default,
as it is already set today in "nova/conf_fixture.py".
Change-Id: I184b1b1cbd85f136cee120965e38e2ef87bb66ff
Markus Zoeller