Update global-jjb to v0.21.5 to pick up hotfix

Pulls in hotfix to resolve the jenkins-cfg job failure.

Change-Id: I9e4b5bf48103f184a154f6cbd2ccb2b3a5a50223
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

diff --git a/jjb/global-jjb b/jjb/global-jjb
index f58aa56acc44a8eb7498af10e5d229e1690e58b0..10f2c5c4799680c148a73ba4af81c6f220a041cc 160000 (submodule)
--- a/jjb/global-jjb
+++ b/jjb/global-jjb
@@ -1 +1 @@
-Subproject commit f58aa56acc44a8eb7498af10e5d229e1690e58b0
+Subproject commit 10f2c5c4799680c148a73ba4af81c6f220a041cc