Install pco plugin on all detector machines

roles/detector/tasks/main.yml

@@ -10,6 +10,7 @@
   with_items:
     - libuca
     - uca-tools
+    - uca-plugin-pco
 
 # This is a temporary solution until the run time is packaged for openSUSE 13.1
 # - name: download siso run-time