Pull in maven metadata validator tool

Change-Id: I23e474f6b8d3feb64d576815076b86076ad8a290
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

diff --git a/jjb/global-jjb b/jjb/global-jjb
index d22c3fe8f7bc3f3276dedd7448c4f82f50fe7584..f52936163e512a126befed7c091bcba94f9fc768 160000 (submodule)
--- a/jjb/global-jjb
+++ b/jjb/global-jjb
@@ -1 +1 @@
-Subproject commit d22c3fe8f7bc3f3276dedd7448c4f82f50fe7584
+Subproject commit f52936163e512a126befed7c091bcba94f9fc768