added new repositories for mcp salt and extra

Change-Id: Id279804a0af7d55481ffaefe3c0c498ff50be510
diff --git a/linux/system/repo/saltstack/xenial.yml b/linux/system/repo/saltstack/xenial.yml
new file mode 100644
index 0000000..0c933b8
--- /dev/null
+++ b/linux/system/repo/saltstack/xenial.yml
@@ -0,0 +1,9 @@
+parameters:
+  _param:
+    salt_version: 2016.3
+  linux:
+    system:
+      repo:
+        salt:
+          source: "deb http://repo.saltstack.com/apt/ubuntu/16.04/amd64/${_param:salt_version} xenial main"
+          key_url: "http://repo.saltstack.com/apt/ubuntu/16.04/amd64/${_param:salt_version}/SALTSTACK-GPG-KEY.pub"
\ No newline at end of file