Update setup.sls
On version 2015.8 we got the similar issue.
```
diff --git a/glusterfs/server/setup.sls b/glusterfs/server/setup.sls
index 0cb13db..18dd8cb 100644
--- a/glusterfs/server/setup.sls
+++ b/glusterfs/server/setup.sls
@@ -1,6 +1,6 @@
{% from "glusterfs/map.jinja" import server with context %}
-{%- if grains['saltversion'] < "2015.8.0" %}
+{%- if grains['saltversion'] < "2016.3.0" %}
{# Parameter force doesn't exist in Salt 2015.8 and without it volume
creation will fail when brick is on root partition #}
{% set force_compatibility = True %}