Switch virtual labs to Salt 2017.7

Change-Id: I2c08014f08cc08ed3cd869adc186974f11c6d313
diff --git a/classes/cluster/sl-pike-dvr/openstack/gateway.yml b/classes/cluster/sl-pike-dvr/openstack/gateway.yml
index 3ac6aac..9fc4ff1 100644
--- a/classes/cluster/sl-pike-dvr/openstack/gateway.yml
+++ b/classes/cluster/sl-pike-dvr/openstack/gateway.yml
@@ -1,7 +1,7 @@
 classes:
 - system.linux.system.repo.mcp.apt_mirantis.openstack
 - system.linux.system.repo.mcp.extra
-- system.linux.system.repo.mcp.apt_mirantis.saltstack_2016_3
+- system.linux.system.repo.mcp.apt_mirantis.saltstack
 - system.linux.network.interface.single_ovs_dvr
 - system.neutron.gateway.cluster
 - cluster.sl-pike-dvr