Switch virtual labs to Salt 2017.7

Change-Id: I2c08014f08cc08ed3cd869adc186974f11c6d313
diff --git a/classes/cluster/virtual-mcp-newton-dvr/stacklight/server.yml b/classes/cluster/virtual-mcp-newton-dvr/stacklight/server.yml
index 33460a6..f466e41 100644
--- a/classes/cluster/virtual-mcp-newton-dvr/stacklight/server.yml
+++ b/classes/cluster/virtual-mcp-newton-dvr/stacklight/server.yml
@@ -1,7 +1,7 @@
 classes:
 - system.docker.host
 - system.linux.system.repo.influxdb
-- system.linux.system.repo.mcp.salt
+- system.linux.system.repo.mcp.saltstack
 - system.linux.system.repo.mcp.apt_mirantis.elastic.5x
 - system.linux.system.repo.mcp.apt_mirantis.kibana.5x
 - system.linux.system.repo.docker