Automate updating endpoints.xml with endpoints from eucarc.

Add option to build.xml to specify endpoints.xml

Add basic walrus tests to CI run

Update AWS Java SDK to latest
Add the updating of endpoints.xml to initS3Client method since some of the tests from @euca-nightfury use that instead of getCloudInfo
Added test for ELB policy crud and supporting ELB ops.
Cleanup for ELB policy crud and supporting ELB ops.
Merge pull request #209 from tbeckham/elb-policy-tests

Elb policy tests