[vector] tests with data providers

[Paul Sandoz]

Hi,

Please review this patch to covert the vector tests to use TestNG data providers:

  http://cr.openjdk.java.net/~psandoz/panama/tests-with-data-providers/webrev/ <http://cr.openjdk.java.net/~psandoz/panama/tests-with-data-providers/webrev/>

For now i took the simplest route placing them in the concrete tests rather than in a super class for a type shared across the shapes (in effect much in the header.template can be moved over to such a super class).

Paul.