Fixed JERSEY-1516.

- Replaced readEntity(…) with getEntity() in OutboundJaxrsResponse copy constructor code.
- Added verification E2E test for the issue.

Change-Id: I103b1ce448e465aac9f6469b481c3006eae68deb
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Fixed multiple minor issues. 

- JERSEY-1484: Field shadowing fixed in JerseyClientTest methods.
- JERSEY-1485: Map parameter made generic in a ClientConfigTest method.
- JERSEY-1487: Local variable hides field in ClientConfig.

Change-Id: I97191f539986dc235cbad073ec15ca6fbb58e195
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Merge "Fixed JERSEY-1516."