Switch virtual labs to Salt 2017.7

Change-Id: I2c08014f08cc08ed3cd869adc186974f11c6d313
diff --git a/classes/cluster/sl-k8s-contrail/infra/config.yml b/classes/cluster/sl-k8s-contrail/infra/config.yml
index f96ac1e..bb5ad1f 100644
--- a/classes/cluster/sl-k8s-contrail/infra/config.yml
+++ b/classes/cluster/sl-k8s-contrail/infra/config.yml
@@ -2,7 +2,7 @@
 - system.docker.client
 - system.docker.host
 - system.linux.system.repo.mcp.apt_mirantis.ubuntu
-- system.linux.system.repo.mcp.salt
+- system.linux.system.repo.mcp.apt_mirantis.saltstack
 - system.linux.system.repo.docker
 - system.openssh.client.lab
 - system.salt.master.pkg