Code review comment for lp:~fwereade/pyjuju/shadow-trunk-1204

*** Submitted:

Constraints feature

End result of many branches merged into
lp:~fwereade/juju/shadow-trunk-1204
over the last couple of weeks. Includes provider-specific constraint
registration (not global), provision for legacy deployments, and
environment
constraints.

R=
CC=
https://codereview.appspot.com/5971047

https://codereview.appspot.com/5971047/