Update to global-jjb v0.13.1

Pulls in the much awaited maven-merge job. We will deploy this to a
few projects to test before making it available to all projects.

Change-Id: Idcdf63bd76510481deef06c13fb9983a47e36486
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

diff --git a/jjb/global-jjb b/jjb/global-jjb
index 4c47edee502585d83b3b1f52a3eb611083383a73..562c3373545caf7c69524adfec4d3cba7e38c0c5 160000 (submodule)
--- a/jjb/global-jjb
+++ b/jjb/global-jjb
@@ -1 +1 @@
-Subproject commit 4c47edee502585d83b3b1f52a3eb611083383a73
+Subproject commit 562c3373545caf7c69524adfec4d3cba7e38c0c5