Switch deployments to Salt 2017.7

Change-Id: Ib51d2a1ccefe8e56e9fa3f73bb761fff0afebafa
diff --git a/jenkins/client/job/deploy/lab/deploy.yml b/jenkins/client/job/deploy/lab/deploy.yml
index a1df125..624e553 100644
--- a/jenkins/client/job/deploy/lab/deploy.yml
+++ b/jenkins/client/job/deploy/lab/deploy.yml
@@ -106,8 +106,8 @@
                 description: "YAML with overrides for Salt deployment"
               SALT_VERSION:
                 type: text
-                default: ""
-                description: "Version of Salt which is going to be installed i.e. 'stable 2016.3' or 'stable 2017.7' etc."
+                default: "stable 2017.7"
+                description: "Version of Salt which is going to be installed i.e. 'stable 2016.3' or 'stable 2017.7' etc. Warning: This value doesn't override salt_version parameter set in the pillar."
               BOOTSTRAP_EXTRA_REPO_PARAMS:
                 type: string
                 default: ""