Fixed JERSEY-2157.

- Automatically buffering error response entity and closing the client connection for error responses when throwing a WAE.
- Added reproducer test to ApacheConnector (where the connection leaking has been spotted).

Change-Id: Ie35c887e1a8ec4bf0e12391091fbc08477d4804d
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Merge "Fixed JERSEY-2157."