API change: juju ssh should pass through ssh arguments

[Jim Baker]

A proposed API change is that juju ssh should allow for standard ssh
arguments, by passing them through to the underlying ssh command. This
feature is requested by https://bugs.launchpad.net/juju/+bug/812441 Such
support enables using juju ssh in the following ways:


Running a command on a remote service unit:

$ juju ssh mysql/0 ls /


Setting up a tunnel:


$ juju ssh -L8080:localhost:80 wordpress/0


Not multiplexing the connection when connecting to machine 7, as might
be nice to do with a tunnel setup (multiplexing the connection is done
by default by juju ssh, but it can be overridden by the user in this way):

$ juju ssh -o "ControlMaster no" -L8080:localhost:80 7


And so forth, any options are simply passed through, along with the ssh
command (such as "ls /" as above). This does mean that ssh is ultimately
responsible for the parsing, so any parse errors are raised by it.


Proposed branch with this change:
https://code.launchpad.net/~jimbaker/juju/ssh-passthrough/+merge/79888


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