[8u60] request for approval: 8039921: SHA1WithDSA with key > 1024 bits not working

[Valerie Peng]

Request for approval for backporting 8039921 into 8u60.

bug:  https://bugs.openjdk.java.net/browse/JDK-8039921
webrev: http://cr.openjdk.java.net/~valeriep/8039921/webrev.00/
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/security-dev/2014-December/011554.html

The changes (source code diffs) are exactly the same as those made to 
JDK 9  except for copyright year being 2015.

Thanks,
Valerie