Use qualified class names instead of importing class just for documentation

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbutils/trunk@1611119 13f79535-47bb-0310-9956-ffa450edef68
Findbugs: don't expose internal mutable state

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbutils/trunk@1611129 13f79535-47bb-0310-9956-ffa450edef68
Findbugs: Nullcheck of value previously dereferenced

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbutils/trunk@1611132 13f79535-47bb-0310-9956-ffa450edef68