This commit updates the SSH template step_config.tpl. This new version
allows to run `step ssh proxycommand` with a `--console` flag that will
execute the OIDC flow using the Device authorization grant flow.
This commit will ignore principals validation when an OIDC provisioner
is used. When the principals in the server does not match the principals
given the validation was failing, even if the proper principals were set
by templates or webhooks. With this change OIDC will not validate the
principals and just set the default ones (name, name@example.org) plus
the ones in the templates.
This commit also includes a change in the templates to allow to pass
a provisioner to the $(step path)/ssh/config template
Related to #807
