RFR (fix+CSR) 8196823: jarsigner should not create a signed jar if the signing fails

[Weijun Wang]

Please review the following

  JBS: https://bugs.openjdk.java.net/browse/JDK-8196823
  CSR: https://bugs.openjdk.java.net/browse/JDK-8196845
  Fix: http://cr.openjdk.java.net/~weijun/8196823/webrev.00/

Some note:

1. I copied the spec from InputStream:transferTo.

2. In jarsigner.Main, error() calls exit(1), so the delete call cannot be put 
inside the finally block.

Thanks
Max