Comment 8 for bug 2008145

@jam, I wasn't advocating we rewrite SSH_CONFIG at all - I think Juju could or should simply use a -o option when it invokes ssh. In my view, juju's use of ssh is an "internal detail" of how juju operates and is not necessarily tied to the user's general ssh config. Juju should be free to invoke ssh with whatever -o options it wants or needs.