Fix DBCP-391
Ensure that the close state of a pooled connection and the underlying connection is consistent when the underlying connection is closed as a result of an error condition.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/branches/DBCP_1_5_x_BRANCH@1563257 13f79535-47bb-0310-9956-ffa450edef68