RFR: 8140344: add support for 3 digit update release numbers

[Rob McKenna]

Hi folks,

With 7u hitting 101 shortly we've noticed that our Version parsing 
infrastructure balks at the extra digit. With that in mind I'd like to 
update the logic surrounding the parsing of version numbers and the test 
itself to use regex instead of the less flexible CharacterSequence method.

http://cr.openjdk.java.net/~robm/8140344/webrev.01/

	-Rob