[9] RFR 8076535: Deprecate the com.sun.jarsigner package

[Jason Uh]

Please review this change to deprecate the com.sun.jarsigner package.

webrev: http://cr.openjdk.java.net/~juh/8076535/00/
jbs: https://bugs.openjdk.java.net/browse/JDK-8076535

Thanks,
Jason