[2.3.x] + (minor update for) implement feature #1481
https://java.net/jira/browse/GRIZZLY-1481

"Make possible to set HttpHandler's context-path and url-patter separately during registration"
[2.3.x] + fix issue #1673
https://java.net/jira/browse/GRIZZLY-1673

"Grizzly Graceful Shutdown throws InterruptedException"