findbugs: ignore: use Sytesm.exit only in appropriate places

findbugs warns about using System.exit() only in appropriate places.
in this case we do need to use exit().
look at exclude-filters.xml for more details

Change-Id: Ia3bd1a72e5f7b78cbea10066d9e6490bee2ade86
Signed-off-by: Shahar Havivi <shavivi@redhat.com>