Add missing quotes around vars

tasks/Amazon/main.yml

@@ -20,5 +20,5 @@
 
   - name: Ensure Sensu is installed
     yum:
-      name: {{ sensu_package }}
-      state: {{ sensu_pkg_state }}
+      name: "{{ sensu_package }}"
+      state: "{{ sensu_pkg_state }}"