JERSEY-1633: Server-Sent Events not working in GlassFish 4 (b68)

- added servlet-based SSE example.

- fixed some TODOs in SSE around using SseFeature.

- fixed blocking of SSE client when running SSE server on a servlet container that was introduced by recent changes related to introducing MVC support.

- ignored sse-item-store-webapp integration test due to SockectExceptions

- Patch 7: ChunkedInput change reverted

- Patch 8: fix of test

Change-Id: I9498e77ff32f22640e176856fc6c6371e2562c64
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>