Updated setup method to retry once on disconnect to try to address issues with Ubuntu 12.04 images.
Merge pull request #2918 from rackspace/setup_disconnect

[rackspace|compute] Updated setup method to retry once on disconnect
[rackspace|loadbalancers] updated code so that you did not need to pass nodes in during load balancer creation
[rackspace|loadbalancers] updated to only call clear on newly created nodes and access rule collections for unpersisted load balancers.
Merge pull request #2924 from rackspace/lb_tweak

[rackspace|loadbalancers] Fix requiring nodes during load balancer creation