Upgrade global-jjb for docker template changes

Get the revised docker templates that allow flexible
choice of docker tag; the version is probably 0.38.4

Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>
Change-Id: I91db942484cc098e0b45d9cb72021738bad2adae

diff --git a/global-jjb b/global-jjb
index b64ed08..6c76914 160000 (submodule)
--- a/global-jjb
+++ b/global-jjb
@@ -1 +1 @@
-Subproject commit b64ed081a0e57c3b4f74947d48a1c226a1a6b54f
+Subproject commit 6c76914981c2b40419447ca692fd4e10424a09ef