HADOOP-16179. hadoop-common pom should not depend on kerb-simplekdc The hadoop-common pom currently has a dependency on kerb-simplekdc. In fact, the only classes used from Kerby are in kerb-core and kerb-util (which is a transitive dependency frmo kerb-core). Depending on kerb-simplekdc pulls a bunch of other unnecessary classes into the hadoop-common classpath.
This changes the hadoop-common pom to depend only on kerb-core.
hadoop-minikdc already had the appropriate dependency on kerb-simplekdc so it continues to pull in what it needs.