Code review comment for lp://staging/~bac/juju-quickstart/local-error-osx

*** Submitted:

Error if local env requested but not supported.

If '-e some-local-environment' is used on a host that does not support
LXC,
then bootstrap will be called and an obscure 'apt-config' error is
thrown.
So, let's not do that. Instead, detect the error early and return an
argparse
error that makes sense.

R=
CC=
https://codereview.appspot.com/104940045

https://codereview.appspot.com/104940045/