setting version to install on siab jobs

Change-Id: Idfb05e0ed6dc356ded8a97681477a39efee6e5c2
diff --git a/jjb/siab.yaml b/jjb/siab.yaml
index 2a87e90..454653f 100644
--- a/jjb/siab.yaml
+++ b/jjb/siab.yaml
@@ -139,6 +139,11 @@
             description: 'PatchSet number in Gerrit'
 
       - string:
+          name: version
+          default: 'latest'
+          description: 'Latest | Stable'
+
+      - string:
           name: Test_Tags
           default: 'TESTTAGS=test1'
           description: ''