Switch virtual labs to Salt 2017.7

Change-Id: I2c08014f08cc08ed3cd869adc186974f11c6d313
diff --git a/classes/cluster/drivetrain-ha/infra/config.yml b/classes/cluster/drivetrain-ha/infra/config.yml
index 5691518..96c4963 100644
--- a/classes/cluster/drivetrain-ha/infra/config.yml
+++ b/classes/cluster/drivetrain-ha/infra/config.yml
@@ -1,5 +1,5 @@
 classes:
-  - system.linux.system.repo.mcp.salt
+  - system.linux.system.repo.mcp.apt_mirantis.saltstack
   - system.linux.system.repo.mcp.extra
   - system.salt.master.pkg
   - system.salt.master.api