
Removed findbugs from the hadoop build images and added spotbugs instead. Upgraded SpotBugs to 4.2.2 and spotbugs-maven-plugin to 4.2.0. Reviewed-by: Masatake Iwasaki <iwasakims@apache.org> (cherry picked from commit 23b343aed17119b905dfa61ab1ce32ab554bfb57) Conflicts: dev-support/docker/Dockerfile hadoop-project/pom.xml