Limit number of cpu usable by docker with salt-model

Change-Id: I597ddeff174e924e319b3fc937d9c519491a1480
diff --git a/jenkins/client/job/salt-models/tests.yml b/jenkins/client/job/salt-models/tests.yml
index 8c04aba..815526e 100644
--- a/jenkins/client/job/salt-models/tests.yml
+++ b/jenkins/client/job/salt-models/tests.yml
@@ -61,6 +61,9 @@
               CONFIG_NODE_NAME_PATTERN:
                 type: string
                 default: "{{config_node_name}}"
+              MAX_CPU_PER_JOB:
+                type: string
+                default: "2"
         test_system_reclass:
           name: test-salt-model-{{name}}
           template:
@@ -168,4 +171,7 @@
               default: ""
             SYSTEM_GIT_REF:
               type: string
-              default: ""
\ No newline at end of file
+              default: ""
+            MAX_CPU_PER_JOB:
+              type: string
+              default: "2"