Optional installation source - pip

source:engine metadata created - defaults to pkg
installation, pip installation alternative added
diff --git a/metadata/service/minion/cluster.yml b/metadata/service/minion/cluster.yml
index 2bc0513..91aaaaa 100644
--- a/metadata/service/minion/cluster.yml
+++ b/metadata/service/minion/cluster.yml
@@ -6,6 +6,8 @@
   salt:
     minion:
       enabled: true
+      source:
+        engine: pkg
       masters:
         - host: ${_param:salt_master_host}
         - host: ${_param:salt_master_host}