RFR: JDK-8222913: Add Jib support for VERSION_EXTRA*

[Erik Joelsson]

JDK-8207849 added support for extra version numbers in the java version 
string. Now we need to use at least one more at Oracle so need to add 
the corresponding support to jib-profiles.js.

Bug: https://bugs.openjdk.java.net/browse/JDK-8222913
Webrev: http://cr.openjdk.java.net/~erikj/8222913/webrev.01/

/Erik