Revert "Upgrade to global-jjb v0.39.0"

This reverts commit 2f1d4851e58106dd108f4a8c84d80390f9745aa9.

lftools v0.25.1 hasn't hit PyPi yet and is having issues getting built
properly. Global-jjb v0.39.0 upgrades to lftools v0.25.1 so we need to
revert until the package is distributed

Change-Id: Icae5362464e50613b350ecc79ef813bd2f1b841a
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>

diff --git a/global-jjb b/global-jjb
index a9f5f8a..ae55fc7 160000 (submodule)
--- a/global-jjb
+++ b/global-jjb
@@ -1 +1 @@
-Subproject commit a9f5f8aaf51591abfd95ba5cb0a437971bdacb11
+Subproject commit ae55fc7cc2d4d29f6cfe63f5294ec8bd97d15479