feat(map): update to v4 “map.jinja”

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.

openssh/init.sls

@@ -1,4 +1,5 @@
-{% from "openssh/map.jinja" import openssh with context %}
+{% from "openssh/map.jinja" import mapdata with context %}
+{%- set openssh = mapdata.openssh %}
 
 openssh:
   {% if openssh.server is defined %}