Only `salt-ssh` can't use them actually.

* openssh/libsaltcli.jinja: detect non empty `opts['__cli']` as `api`.

* openssh/libmatchers.jinja: only `ssh` and `unknown` can't use
  `config.get` options `merge` and `delimiter`.

The `map.jinja` now exports a single variable called `mapdata`.

We extract the `openssh`, `sshd_config` and `ssh_config` from it to
minimize the changes to `.sls` files.