[Bug 415999] Fix some of FindBugs warnings

Mostly not closed streams/DB resources are fixed. But also less
important things.

Signed-off-by: Mikhail Mazursky <mikhail.mazursky@gmail.com>
Merge remote-tracking branch 'origin/master' into jetty-9.1

Conflicts:
	jetty-start/src/main/java/org/eclipse/jetty/start/Main.java
	jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java