add STACK_COMPUTE_COUNT to aws deploy job

Change-Id: I884762fcebb98601d1c31487d116379519bcf0df
diff --git a/jenkins/client/job/deploy/lab/mk/cloud.yml b/jenkins/client/job/deploy/lab/mk/cloud.yml
index e6fb6d5..a79414b 100644
--- a/jenkins/client/job/deploy/lab/mk/cloud.yml
+++ b/jenkins/client/job/deploy/lab/mk/cloud.yml
@@ -59,6 +59,9 @@
               STACK_REUSE:
                 type: boolean
                 default: 'false'
+              STACK_COMPUTE_COUNT:
+                type: string
+                default: '2'
 
               STACK_TEMPLATE_URL:
                 type: string