Switch to 2017.7 as default

Change-Id: Idd06e869f946dbbff4173b2eeb2f3e54a4ff6707
diff --git a/tcp_tests/templates/virtual-mcp11-k8s-calico-minimal/underlay--user-data1604.yaml b/tcp_tests/templates/virtual-mcp11-k8s-calico-minimal/underlay--user-data1604.yaml
index c0c8e1f..23b112f 100644
--- a/tcp_tests/templates/virtual-mcp11-k8s-calico-minimal/underlay--user-data1604.yaml
+++ b/tcp_tests/templates/virtual-mcp11-k8s-calico-minimal/underlay--user-data1604.yaml
@@ -58,8 +58,8 @@
 
    - echo "deb [arch=amd64] http://apt.mirantis.com/xenial {{ REPOSITORY_SUITE }} salt extra" > /etc/apt/sources.list.d/mcp_salt.list;
    - wget -O - http://apt.mirantis.com/public.gpg | apt-key add -;
-   - echo "deb http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2016.3 xenial main" > /etc/apt/sources.list.d/saltstack.list;
-   - wget -O - https://repo.saltstack.com/apt/ubuntu/16.04/amd64/2016.3/SALTSTACK-GPG-KEY.pub | apt-key add -;
+   - echo "deb http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2017.7 xenial main" > /etc/apt/sources.list.d/saltstack.list;
+   - wget -O - https://repo.saltstack.com/apt/ubuntu/16.04/amd64/2017.7/SALTSTACK-GPG-KEY.pub | apt-key add -;
 
    - apt-get clean
    - eatmydata apt-get update && apt-get -y upgrade