Adding ability to specify Java Options to Ant

You can now specify the Java Options to pass to ant.  The leading dash is
needed and multiples are specified like:
   java-opts:
      - "-ea"
      - "-Xmx512m"
I only changed the builders.py file and I followed the properties section
above my change as a template.

Change-Id: Ifa3d06a53b160444224f308d36e7b2bd903591bd
Reviewed-on: https://review.openstack.org/23097
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins