Switch JJB to 2.0.0.0b2

Switch to using JJB v2.0.0.0b2 which is the current released beta of
JJB2 and supports basic Pipeline jobs.

Change-Id: Iac6d40e7de8ebd5897883ae8b8dc41da63826c86
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>
diff --git a/jjb/ci-management/ci-management.yaml b/jjb/ci-management/ci-management.yaml
index de57909..2917fab 100644
--- a/jjb/ci-management/ci-management.yaml
+++ b/jjb/ci-management/ci-management.yaml
@@ -17,3 +17,5 @@
     name: ci-management-jobs
     project: 'ci-management'
     project-name: 'ci-management'
+
+    jjb-version: 2.0.0.0b2