SQOOP-928: PostgresqlManager should rollback any pending changes instead of commit when closing connections

(Venkat Ranganathan via Jarek Jarcec Cecho)

src/java/org/apache/sqoop/manager/PostgresqlManager.java

@@ -96,7 +96,7 @@ protected String escapeIdentifier(String identifier) {
   @Override
   public void close() throws SQLException {
     if (this.hasOpenConnection()) {
-      this.getConnection().commit(); // Commit any changes made thus far.
+      this.getConnection().rollback(); // rollback any pending changes.
     }
 
     super.close();