Code review comment for lp:~frankban/juju-quickstart/handle-machine-errors

*** Submitted:

Improve machine errors handling.

Quickstart no longer hangs when the GUI
machine goes in an "error" state and, as
a consequence, the unit is forever in
a "pending" state.

Also fixed the message printed at the
end of the process suggesting how to
destroy the environment
(sudo is used where required).

Tests: `make check`.

QA: I already asked Rick to reproduce the trusty/LXC
errors he encountered QAing my previous branch.
The GUI no longer hangs.
I'd also appreciate any other suggestion and additional
QA, given that this branch is a good candidate for 1.0.

R=bac, rharding
CC=
https://codereview.appspot.com/51350044

https://codereview.appspot.com/51350044/