Code review comment for lp:~axwalk/juju-core/ssh-proxycommand

Reviewers: mp+211662_code.launchpad.net,

Message:
Please take a look.

Description:
Add --proxy option to "juju ssh"

juju ssh will now, by default, proxy
connections through the API server host.
I have not yet implemented support for the
ProxyCommand option for the go.crypto/ssh
client; this will be done as a follow up.

https://code.launchpad.net/~axwalk/juju-core/ssh-proxycommand/+merge/211662

(do not edit description out of merge proposal)

Please review this at https://codereview.appspot.com/77340046/

Affected files (+300, -89 lines):
   A [revision details]
   M cmd/juju/scp.go
   M cmd/juju/scp_test.go
   M cmd/juju/ssh.go
   M cmd/juju/ssh_test.go
   M juju/api.go
   M juju/apiconn_test.go
   M juju/export_test.go
   M state/api/apiclient.go
   M state/api/client.go
   M state/api/params/params.go
   M state/apiserver/client/client.go
   M state/apiserver/client/client_test.go
   M utils/ssh/ssh.go
   M utils/ssh/ssh_openssh.go