DERBY-6237(PreparedStatement.execute() fails starting 10.2 when multiple rows are updated and PreparedStatement.setCharacterStream(int, Reader, int) is used)

This test adds test case for updating more than one row with setCharacterStream to update VARCHAR column in the underlying table. This works in 10.1



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.1@1488445 13f79535-47bb-0310-9956-ffa450edef68