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.
