Remove unused import.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1571770 13f79535-47bb-0310-9956-ffa450edef68
Remove unused import. Organize imports.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1571772 13f79535-47bb-0310-9956-ffa450edef68
Access constant directly.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1571773 13f79535-47bb-0310-9956-ffa450edef68
Access constant directly.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1571774 13f79535-47bb-0310-9956-ffa450edef68