Include a reference to the environment in Azure instances.
Spike to open ports on machines.
Spike to open ports on environ.
Test for OpenPorts() wip.
Full test for azureInstance.OpenPorts().
Test OpenPorts() for failure modes.
Back-out the change to azureEnviron.OpenPorts(); this will be resurrected in another branch.
Check UploadRole payload, and factor out some test setup.
Fix misleading test data.
Extract serialize() helper.
Tidy.
[r=allenap] Implement azureInstance.OpenPorts()