problem with bzr push when using sftp

[Martin Pool]

Thanks for connecting that up.

'Service Request' is described in <http://www.ietf.org/rfc/rfc4253.txt>.

It looks like paramiko sends one ssh-userauth request per call to
auth_* method (eg auth_password etc), and in _paramiko_auth, bzr calls
these sequentially to try to find an acceptable authentication
mechanism.  That seems on the face of it reasonable to me.

<http://www.ietf.org/rfc/rfc4252.txt> strongly suggests that it's fine
to send multiple service requests until you find one the service
accepts.

Martin