Move default's salt from 2016.3 -> 2017.7

Change-Id: I55a3b4ac90ece40c5ec3a9656bb607307f3a4905
diff --git a/ubuntu-14.04/template.json.env b/ubuntu-14.04/template.json.env
index 6eb61c4..3a0e0b9 100644
--- a/ubuntu-14.04/template.json.env
+++ b/ubuntu-14.04/template.json.env
@@ -7,8 +7,8 @@
 UBUNTU_BASEURL=http://mirror.mirantis.com/stable/ubuntu/
 
 # salt.sh
-SALTSTACK_REPO=${SALTSTACK_REPO:-"deb [arch=amd64] https://mirror.mirantis.com/stable/saltstack-2016.3/trusty/ trusty main"}
-SALTSTACK_GPG=${SALTSTACK_GPG:-"https://repo.saltstack.com/apt/ubuntu/16.04/amd64/2016.3/SALTSTACK-GPG-KEY.pub"}
+SALTSTACK_REPO=${SALTSTACK_REPO:-"deb [arch=amd64] https://mirror.mirantis.com/stable/saltstack-2017.7/trusty/ trusty main"}
+SALTSTACK_GPG=${SALTSTACK_GPG:-"https://repo.saltstack.com/apt/ubuntu/16.04/amd64/2017.7/SALTSTACK-GPG-KEY.pub"}