Make AMPS compatible with Java 11
AMPS currently does not compile when using Java 11. In addition, some of the maven-amps-plugin tasks do not work under Java 11 because they rely on maven plugins that are too old.
upgrade commons-lang to commons-lang3 3.8
upgrade guava to 26.0-jre
upgrade mockito to 2.21+
upgrade a number of maven plugins (enforcer, surefire, bundle, javadoc)