We avoid compatibility break with user pillars by looking up
configuration values using `config.get` in configurable roots.
We provide a new parameter `map_jinja:config_get_roots` in the formula
`parameters/defaults.yaml`to retrives values not only from
`tplroot=openssh` but from `sshd_config` and `ssh_config` too.
We need to update the `_mapdata` reference files to include the new
`map_jinja:config_get_roots`.
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.
Daniel Dehennin