SAK-25878 Exclude the findbugs annotations from the final WAR.

Findbugs annotations aren't needed at runtime and so the JAR doesn't need to be bundled up into the webapp.

git-svn-id: https://source.sakaiproject.org/svn/login/trunk@307170 66ffb92e-73f9-0310-93c1-f5514f145a0a