Clean up class loading problem with the ServletContainerInitializer

Sorry about the problem with my last PR. Basically the problem was just because the ANNOTATION_ATTRIBUTE contstant was on the SCI class. Even then this would not have been a problem if I had just hard coded the attribute name instead of using .getPackage() to generate the attribute name,

Rather than trying to catch the solution I think it is cleaner to just move the attribute name.