Add ability to set priority and pin for linux system repo

Change-Id: I3b7fd3da8433a2dc3fcc44dba708cadceaf83ba5
diff --git a/classes/cluster/virtual-mcp11-aio/init.yml b/classes/cluster/virtual-mcp11-aio/init.yml
index 86627d2..d75ffcd 100755
--- a/classes/cluster/virtual-mcp11-aio/init.yml
+++ b/classes/cluster/virtual-mcp11-aio/init.yml
@@ -51,6 +51,10 @@
           source: ${_param:linux_system_repo}
           architectures: amd64
           clean_file: true
+          pin:
+          - pin: ${_param:linux_system_repo_pin}
+            priority: ${_param:linux_system_repo_priority}
+            package: '*'
     network:
       bridge: openvswitch
       interface: