tinc: remove jessie

tinc/init.sls

-{% if grains['oscodename'] == 'stretch' %}
 debian-experimental:
   pkgrepo.managed:
     - name: deb http://deb.debian.org/debian experimental main
@@ -20,9 +19,3 @@ debian-experimental:
 tinc:
   pkg.installed:
     - fromrepo: experimental
-
-{% else %}
-tinc:
-  pkg.installed
-
-{% endif %}