Switch virtual labs to Salt 2017.7

Change-Id: I2c08014f08cc08ed3cd869adc186974f11c6d313
diff --git a/classes/cluster/virtual-offline-pike-ovs/init.yml b/classes/cluster/virtual-offline-pike-ovs/init.yml
index 470680c..6e3b1fc 100644
--- a/classes/cluster/virtual-offline-pike-ovs/init.yml
+++ b/classes/cluster/virtual-offline-pike-ovs/init.yml
@@ -4,7 +4,7 @@
 - system.heka.log_collector.single
 - system.heka.log_collector.output.telegraf
 - system.linux.system.repo_local.mcp.extra
-- system.linux.system.repo_local.mcp.apt_mirantis.saltstack_2016_3
+- system.linux.system.repo_local.mcp.apt_mirantis.saltstack
 - system.linux.system.repo_local.mcp.apt_mirantis.ubuntu
 - system.linux.system.single
 - system.rsyslog.client.single