RFR 8020802: Need an ability to create jar files that are invariant to the pack200 packing/unpacking

[Alexander Zuev]

Hi,

   please review my fix for
8020802: Need an ability to create jar files that are invariant to the 
pack200 packing/unpacking
The fix adds new option to the jar command which makes created jars 
normalized without the need to invoke the
external program.

Bug description: https://bugs.openjdk.java.net/browse/JDK-8020802
Webrev with proposed fix: 
http://cr.openjdk.java.net/~kizune/8020802/webrev.01

With best regards,
/Alex