Adding SLAVE_NODE parameter to run job on the slave

The patch adds SLAVE_NODE parameter to job in order to run a job
on particular Jenkins slave.

Change-Id: Ife593c9e2a8ad114069b936a0833d0b9be9c4c53
diff --git a/jenkins/client/job/deploy/lab/deploy.yml b/jenkins/client/job/deploy/lab/deploy.yml
index e64858a..108e30d 100644
--- a/jenkins/client/job/deploy/lab/deploy.yml
+++ b/jenkins/client/job/deploy/lab/deploy.yml
@@ -27,6 +27,9 @@
               ASK_ON_ERROR:
                 type: boolean
                 default: 'false'
+              SLAVE_NODE:
+                type: string
+                default: 'python'
 
               # deployments
               STACK_NAME: