get Display Granularity
Returns the display granularity of the events to be logged. For example, if set to 0, a method-level event will be displayed as "Test Run >Test Worker x >org.SomeClass >org.someMethod". If set to 2, the same event will be displayed as "org.someClass >org.someMethod".
-1 denotes the highest granularity and corresponds to an atomic test.
Return
the display granularity of the events to be logged