412318 HttpChannel fix multiple calls to _transport.completed() if handle() is called multiple times while the channel is COMPLETED
Revert "412318 HttpChannel fix multiple calls to _transport.completed() if handle() is called multiple times while the channel is COMPLETED"

This reverts commit cb2eb030d18b6c92f3249794c02b100f0ee5cb33.
Revert "Revert "412318 HttpChannel fix multiple calls to _transport.completed() if handle() is called multiple times while the channel is COMPLETED""

This reverts commit 474d9fec28917bcae9cb9cfdc504aa54243a9b50.
412318 HttpChannel fix multiple calls to _transport.completed() if handle() is called multiple times while the channel is COMPLETED
409845 add test that makes sure that DataFrameGenerator correctly prepends the header information
Merge remote-tracking branch 'origin/master' into jetty-9.1

Conflicts:
	jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannel.java
	jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannelState.java