feat(templates): don't get openssh pillars in templates

We pass the pillars via the template engine context, this avoid the
need to load `map.jinja` from the templates themselves and recude the
number of `pillar.get` calls.

* openssh/config.sls (sshd_config): pass `sshd_config` in the
  context.
  (ssh_config): pass `ssh_config` in the context.

* openssh/files/default/ssh_config: remove `map.jinja` import since
  it's now in the context.

* openssh/files/default/sshd_config: ditoo.

* openssh/known_hosts.sls: pass `known_hosts` in the context.

* openssh/files/default/ssh_known_hosts: use `known_hosts` from the
  context instead of calling `pillar.get` several times.

BREAKING CHANGE: Minimum Salt version support is now `2019.2` in line
with official upstream support; also use of the `traverse` Jinja filter.

openssh/files/default/sshd_config

@@ -1,4 +1,3 @@
-{% from "openssh/map.jinja" import sshd_config with context %}
 {#- present in sshd_config and known in actual file options -#}
 {%- set processed_options = [] -%}