8054565: FilterOutputStream.close may throw IOException if called twice and underlying flush or close fails
Reviewed-by: alanb, prappo
Contributed-by: Chris Hegarty <chris.hegarty@oracle.com>, Nathan Clement <nathan.a.clement@hotmail.com>

7015589: (spec) BufferedWriter.close leaves stream open if close of underlying Writer fails
Reviewed-by: forax, mduigou