Add avability to configure rally scenarios files

Change-Id: I7de8bca10b6f3a4693bd8a4299ebe9842c8e5889
diff --git a/jenkins/client/job/validate.yml b/jenkins/client/job/validate.yml
index 6d3ecda..6bf4cac 100644
--- a/jenkins/client/job/validate.yml
+++ b/jenkins/client/job/validate.yml
@@ -126,6 +126,14 @@
               type: string
               default: ""
               description: Git branch which will be used during the checkout
+            RALLY_SCENARIOS:
+              type: string
+              default: ""
+              description: Rally scenarios directory or file with scenarios
+            RALLY_TASK_ARGS_FILE:
+              type: string
+              default: ""
+              description: Rally scenarios arguments file
             AVAILABILITY_ZONE:
               type: string
               default: "nova"