reduced test times
415330 Avoid multiple callbacks at EOF
Merge remote-tracking branch 'origin/master' into jetty-9.1

Conflicts:
	jetty-server/src/main/java/org/eclipse/jetty/server/HttpOutput.java
	jetty-util/src/main/java/org/eclipse/jetty/util/IteratingCallback.java
Merge branch 'jetty-9.1' of ssh://git.eclipse.org/gitroot/jetty/org.eclipse.jetty.project into jetty-9.1