Add mod_xsenfile (Debian)

apache/mod_xsendfile.sls

+{% from "apache/map.jinja" import apache with context %}
+
+include:
+  - apache
+
+mod-xsendfile:
+  pkg.installed:
+    - name: {{ apache.mod_xsendfile }}
+    - order: 180
+    - require:
+      - pkg: apache
+
+{% if grains['os_family']=="Debian" %}
+a2enmod xsendfile:
+  cmd.run:
+    - order: 225
+    - unless: ls /etc/apache2/mods-enabled/xsendfile.load
+    - require:
+      - pkg: mod-xsendfile
+    - watch_in:
+      - module: apache-restart
+
+{% endif %}
+