Rename salt -> saltstack repository to fix inconsistency with image

Change-Id: Iae43a9d75c492564cdf9d2da6eeaa98888f193fd
diff --git a/linux/system/repo/saltstack_2016_3_trusty.yml b/linux/system/repo/saltstack_2016_3_trusty.yml
index c7e03d7..d968734 100644
--- a/linux/system/repo/saltstack_2016_3_trusty.yml
+++ b/linux/system/repo/saltstack_2016_3_trusty.yml
@@ -3,6 +3,8 @@
   linux:
     system:
       repo:
-        salt:
+        saltstack:
           source: "deb http://repo.saltstack.com/apt/ubuntu/14.04/amd64/2016.3 trusty main"
-          key_url: "http://repo.saltstack.com/apt/ubuntu/14.04/amd64/2016.3/SALTSTACK-GPG-KEY.pub"
\ No newline at end of file
+          key_url: "http://repo.saltstack.com/apt/ubuntu/14.04/amd64/2016.3/SALTSTACK-GPG-KEY.pub"
+        salt:
+          enabled: false