ng.install: subscribe to repo only if install_from_repo variable is set to true

nginx/ng/install.sls

@@ -51,7 +51,12 @@ nginx_zypp_repo:
 
 {% if salt['grains.get']('os_family') == 'RedHat' %}
 nginx_yum_repo:
-  pkgrepo.managed:
+  pkgrepo:
+    {%- if nginx.install_from_repo %}
+    - managed
+    {%- else %}
+    - absent
+    {%- endif %}
     - name: nginx
     - humanname: nginx repo
     {%- if salt['grains.get']('os') == 'CentOS' %}