[2.3.x] + checkpoint for
issue #1527
https://java.net/jira/browse/GRIZZLY-1527

"Implement client-side Connection pool"
[2.3.x] Fix copyright.
[2.3.x] Incremental changes for https://java.net/jira/browse/GRIZZLY-1519 (Introduce cookie parsing/serializing based on http://tools.ietf.org/html/rfc6265)