Merge juju-machine-registration [f=1362506] [r=adam-collard,ack] [a=Free Ekanayaka]
This branch:
- Bumps the server API to 3.3: this will let us introduce a new schema
for the juju-info registration field, since we have released clients
out there that could potentially send the old juju-info schema (although
they'd need to be deployed with an older version of the client charm,
so it's more a theoretical situation than one that can happen in practice).
A server branch has been pushed to bump the server to API 3.3. as well.
- Include the machine ID information in the registration message if the server
is capable of handling it.