[master] + fix the issue #1592
https://java.net/jira/browse/GRIZZLY-1592

"HTTP Reader may fail to read() single char"
[master] Initial changes for :
    - https://java.net/jira/browse/GRIZZLY-1594 (ReadHandler callbacks should not be performed in I/O thread.)
    - https://java.net/jira/browse/GRIZZLY-1593 (Mirror for https://java.net/jira/browse/GLASSFISH-20681 (TimeoutException when delivering static web sites))
[master] Port testProvocativeWrite() test from 2.3 as this verifies that the WriteHandler is being invoked in the proper thread.