build: Update to findbugs 3

Ensures Java 8 compatibility.

The patch also adds/corrects various pieces of meta data in the pom.

Target: trunk
Require-notes: no
Require-book: no
Request: 2.10
Request: 2.9
Request: 2.8
Request: 2.7
Request: 2.6
Acked-by: Paul Millar <paul.millar@desy.de>
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>