Adding SLAVE_NODE job parameter

The patch adds SLAVE_NODE parameter to the job to be run on
variety of jenkins slaves.

Change-Id: I4cb5c929e27fd617aa82c3c3a07b662c8d337682
Related-PROD: PROD-15212
diff --git a/jenkins/client/job/oscore/tests.yml b/jenkins/client/job/oscore/tests.yml
index 5e5f743..4844708 100644
--- a/jenkins/client/job/oscore/tests.yml
+++ b/jenkins/client/job/oscore/tests.yml
@@ -163,6 +163,9 @@
                 type: string
                 description: Job for results processing
                 default: "{{proc_results_job}}"
+              SLAVE_NODE:
+                type: string
+                default: 'python'
               # salt
               SALT_MASTER_CREDENTIALS:
                 type: string