Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Move global-jjb parameter from releng to global"
  - Move global-jjb parameter from releng to global

    As these only affect jobs defined in global-jjb (no other jobs used
    these variable names) they should be safe to define at the global level.

    Change-Id: I646c3afc73757bff561cc84b80df064e13680080
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d1198df..02b2a1b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d1198dfb66c99f89103cf2ed219f2f82c0fca224
+Subproject commit 02b2a1bca2b0febdf843750c8a76dc203ae604aa