fix(jinja): encode context as json

Or with python2 the template are generated with `u'<string>'`.

openssh/config.sls

               ) }}
     - template: jinja
     - context:
-        sshd_config: {{ sshd_config }}
+        sshd_config: {{ sshd_config | json }}
     - user: {{ openssh.sshd_config_user }}
     - group: {{ openssh.sshd_config_group }}
     - mode: {{ openssh.sshd_config_mode }}
               ) }}
     - template: jinja
     - context:
-        ssh_config: {{ ssh_config }}
+        ssh_config: {{ ssh_config | json }}
     - user: {{ openssh.ssh_config_user }}
     - group: {{ openssh.ssh_config_group }}
     - mode: {{ openssh.ssh_config_mode }}

openssh/known_hosts.sls

               ) }}
     - template: jinja
     - context:
-        known_hosts: {{ openssh | traverse("known_hosts", {}) }}
+        known_hosts: {{ openssh | traverse("known_hosts", {}) | json }}
     - user: root
     - group: {{ openssh.ssh_config_group }}
     - mode: 644