With the current implementation the log threshold is only set when the
annotation is done on the exact class, which means that in cases where
an abstract test class is extended by several derived test classes, it
is necessary to add the annotation on each derived class individually.
Allow the annotation to be inherited, so that it is possible to only
annotate the base class, and it will also be effective for all derived
classes.
Change-Id: I0501b2a617161a391478313b6f9891108bdf9969