Handle dynamic nginx ssl options

ssl protocol options for nginx are hard coded in the formula

added documentation for changing nginx ssl options
Change-Id: Id937911f64febaf707f44aecd5864a15562bb2c3
diff --git a/.kitchen.yml b/.kitchen.yml
index 06dc04e..6106a4a 100644
--- a/.kitchen.yml
+++ b/.kitchen.yml
@@ -50,6 +50,11 @@
       pillars-from-files:
         nginx.sls: tests/pillar/horizon_with_ssl.sls
 
+  - name: horizon_with_ssl_options
+    provisioner:
+      pillars-from-files:
+        nginx.sls: tests/pillar/horizon_with_ssl_options.sls
+
   - name: proxy
     provisioner:
       pillars-from-files: