add elb support for provisioning, for sandboxes.edx.org
get instance id
sudo=False to post tasks
adding state
using set_fact to remember launch and termination ids
adding some debug
deregistering instance along with termination
passing elb name in for deregister
only deregister if an instance was found
Merge pull request #452 from edx/jarv/provision-elb

Jarv/provision elb