Added reproducer test for JERSEY-1525.

- Verifies that a Throwable exception mapper is invoked for a NPE thrown in a response filter.

Change-Id: I9af9221a67e3a5e33d20fb968066976968a9e02b
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Added more filter E2E tests.

- new tests have been added to cover filter invocations in combination with exceptions thrown from different request processing lifecycle phases.

Change-Id: Iec1d1176ac1c52a819a8b5331b06da5d4fa3e3eb
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Merge "Added reproducer test for JERSEY-1525."