DERBY-6214 (PreparedStatement.setObject(int, Object, Types.CLOB) fail with DerbyNet)

Adding junit test to set CLOB column value using setObject and setString. The test has been disabled when updating more than one row and 
1)using setObject to set the value since it runs into closed stream error
2)using setString with large string(test works fine for smaller strings) since it runs into closed stream error



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1484649 13f79535-47bb-0310-9956-ffa450edef68