Code review comment for lp:~wallyworld/juju-core/deprecate-tools-url

Reviewers: mp+194649_code.launchpad.net,

Message:
Please take a look.

Description:
Add back support for deprecated tools-url

Removing tools-url from config too early breaks
upgrades so add it back for the next release.

https://code.launchpad.net/~wallyworld/juju-core/deprecate-tools-url/+merge/194649

(do not edit description out of merge proposal)

Please review this at https://codereview.appspot.com/24340043/

Affected files (+117, -3 lines):
   A [revision details]
   M environs/config/config.go
   M environs/config/config_test.go