Update to latest Varnish role version for CentOS 6 fix.

Author: geerlingguy

provisioning/requirements.yml

@@ -76,4 +76,4 @@
 - src: geerlingguy.solr
   version: 3.5.1
 - src: geerlingguy.varnish
-  version: 1.8.3
+  version: 1.8.4

provisioning/roles/geerlingguy.varnish/tasks/setup-RedHat.yml

@@ -13,9 +13,13 @@
     state: present
   when: ansible_distribution_major_version|int < 7
 
+- name: Set a string for the varnish repository identifier.
+  set_fact:
+    varnish_yum_repo: "varnish-{{ varnish_version }},epel"
+
 - name: Set repo fact appropriately.
   set_fact:
-    varnish_yum_enablerepo: "{{ 'varnish-{{ varnish_version }},epel' if (ansible_distribution_major_version|int < 7) else 'epel' }}"
+    varnish_yum_enablerepo: "{{ varnish_yum_repo if (ansible_distribution_major_version|int < 7) else 'epel' }}"
 
 - name: Install Varnish.
   yum: