[7u6] Request for approval for 7168191: Signature validation can fail under certain circumstances

[Vincent Ryan]

Please approve the following P2 fix for 7u6:
    http://cr.openjdk.java.net/~vinnie/7168191/webrev.01

The bug report is at:
    http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7168191

The fix is currently being reviewed by Sean Mullan and the OpenJDK
security-dev email list.

The fix is not yet in JDK 8 because the code bases are significantly
different due to a major enhancement to the certificate path validation
code which has recently been integrated into JDK 8.

I intend to forward-port this fix to JDK 8 following the integration
of this changeset into 7u6.

Thanks.