Adding ability to pass salt version in bootstrap

The patch adds ability to pass salt version which
is going to be installed on bootstrap stage.

Change-Id: I123c17750dbd9b61362b7648220872b6fb08e752
Related-PROD: PROD-20581
Depends-On: I7bc313a0c28aedfbd305c7fa323c53d981594f7f
diff --git a/jenkins/client/job/deploy/lab/deploy.yml b/jenkins/client/job/deploy/lab/deploy.yml
index 879d7c9..7febca9 100644
--- a/jenkins/client/job/deploy/lab/deploy.yml
+++ b/jenkins/client/job/deploy/lab/deploy.yml
@@ -100,6 +100,10 @@
                 type: text
                 default: ""
                 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."
               BOOTSTRAP_EXTRA_REPO_PARAMS:
                 type: string
                 default: ""