[2.3.x] + implement feature #1658
https://java.net/jira/browse/GRIZZLY-1658
"Implement graceful shutdown feature for Connections"
[2.3.x] implement improvement #1650
https://java.net/jira/browse/GRIZZLY-1650
"Glassfish AJP connector has fixed max packet size (should be configurable)"
[2.3.x] fixed issue #1659
https://java.net/jira/browse/GRIZZLY-1659
"In some cases, a failed notification is not called in processing multiparts"
[2.3.x] fixed issue #1659
https://java.net/jira/browse/GRIZZLY-1659
"In some cases, a failed notification is not called in processing multiparts"
+ rolled back wrong commit from master branch.