Switch virtual labs to Salt 2017.7

Change-Id: I2c08014f08cc08ed3cd869adc186974f11c6d313
diff --git a/classes/cluster/sl-k8s-calico/infra/init.yml b/classes/cluster/sl-k8s-calico/infra/init.yml
index 270fec0..01f8053 100644
--- a/classes/cluster/sl-k8s-calico/infra/init.yml
+++ b/classes/cluster/sl-k8s-calico/infra/init.yml
@@ -1,7 +1,7 @@
 classes:
 - system.linux.system.single
 - system.linux.system.repo.mcp.extra
-- system.linux.system.repo.mcp.salt
+- system.linux.system.repo.mcp.apt_mirantis.saltstack
 - system.linux.system.repo.mcp.apt_mirantis.ubuntu
 - system.openssh.server.team.all
 - system.rsyslog.client.single