typo: Fix a typo in a warning

typo: Fix a typo in a warning

We accidentally had "% should" rather than something like "%s should".
I went with "%q should" because that matched how we wrote the other
variable eariler in the message.

I still don't understand why the log message: 
  http://162.213.34.53:8080/job/upgrade-and-deploy-devel/29/console
is chock full of Warnings about environments that we shouldn't be
using. I can understand seeing a warning about the active environment,
but I thought we didn't try to Validate environments that we weren't
using.

Anyway, *this* fix should be trivially obvious.

https://code.launchpad.net/~jameinel/juju-core/typo-1250149/+merge/194993

(do not edit description out of merge proposal)

[jameinel, 2013-11-13 07:12:18]

Please take a look.

[axw, 2013-11-13 07:17:12]

On 2013/11/13 07:12:18, jameinel wrote:
> Please take a look.

LGTM

We don't validate the config in the sense of using the provider's Validate
method, but reading environments.yaml does do a config.New for each section.
That's where the deprecation warning lies.

[axw, 2013-11-13 07:18:44]

On 2013/11/13 07:17:12, axw wrote:
> On 2013/11/13 07:12:18, jameinel wrote:
> > Please take a look.
> 
> LGTM
> 
> We don't validate the config in the sense of using the provider's Validate
> method, but reading environments.yaml does do a config.New for each section.
> That's where the deprecation warning lies.

So, re-reading, I guess you actually knew that :)
Perhaps we should just store the bytes, and defer the config.New until it's
requested.