Minor adjustments to jax Makefiles and added a test target to top makefile

[Joe Darcy]

Kelly O'Hair wrote:
>
> Changes on their way...  doing full builds to try them out.
>
> 6960333: Add make level ALLOW_DOWNLOADS=true option
> 6960335: Add top level 'make test' rule that uses test/Makefile, runs 
> all test batches
>
> http://cr.openjdk.java.net/~ohair/openjdk6/jax-make-test-allow/webrev/
>
> Minor jaxp/jaxws makefile adjustment, and a new top level Makefile 
> "test" target.

Hi Kelly.

Approved to go back contingent on successful builds.

Thanks,

-Joe