Fixed JERSEY-1609.

- Client config snapshot taken at a single place in the WebTarget constructor call hierarchy. This closes the small thread-safety gap reported in the issue.

Change-Id: I0d530749c2b478f775570c9a8d02dd7d7dc4629e
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>
Merge "Fixed JERSEY-1609."