Change the call to server.get_repositories to filter on the server side 

based on the VCS type inside the clients.
We have over 3000 git repos in our instance (but significantly less SVN 

repos) and have people working overseas from our RB instance causing 

over 100 network call roundtrips.  This reduces those extra calls to 

the single digits.

I've tested manually by digging into the Rest API, code review, and 

manual testing at LinkedIn.  We have forked rbtools internally to deploy

this patch also.
Ran Unit tests:

Ran 167 tests in 39.185s

OK (SKIP=28)