Rename salt -> saltstack repository to fix inconsistency with image

Change-Id: Iae43a9d75c492564cdf9d2da6eeaa98888f193fd
diff --git a/linux/system/repo/saltstack/trusty.yml b/linux/system/repo/saltstack/trusty.yml
index 68ce215..a4bde9a 100644
--- a/linux/system/repo/saltstack/trusty.yml
+++ b/linux/system/repo/saltstack/trusty.yml
@@ -4,7 +4,9 @@
   linux:
     system:
       repo:
-        salt:
+        saltstack:
           source: "deb http://repo.saltstack.com/apt/ubuntu/14.04/amd64/${_param:salt_version} trusty main"
           architectures: amd64
-          key_url: "http://repo.saltstack.com/apt/ubuntu/14.04/amd64/${_param:salt_version}/SALTSTACK-GPG-KEY.pub"
\ No newline at end of file
+          key_url: "http://repo.saltstack.com/apt/ubuntu/14.04/amd64/${_param:salt_version}/SALTSTACK-GPG-KEY.pub"
+        salt:
+          enabled: false