SCS must handle 2 URLs in Ad RSpec

[Aaron Helsinger]

ExoGENI Ad RSpecs include generally 2 URLs comma separated in the url attribute.

1 of these is the ExoSM, the other is the individual rack.

What should the SCS report in the workflow?

Options:

1. Both. Then the tools have to figure out what to do
2. Only the local rack.

I vote #2. Pick that by picking the URL that is not "geni.renci.org". This is probably the 2nd URL.

Sample element:

            <ns2:aggregate id="urn:publicid:IDN+exogeni.net:nictaNet+authority+am" url="https://geni.renci.org:11443/xmlrpc,https://nicta-hn.exogeni.net:11443/xmlrpc">      

[xyang@maxgigapop.net]

Patched the code to support #2.