Update git submodules

* Update docs/submodules/releng from branch 'master'
  - openci: Run jobs on xci slaves

    Change-Id: I58fc2c56d32c04f2c96136ed69335b5c64771e05
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ac647b0..4bc3852 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ac647b0414bd14615ebd4927a2926b328eaceda1
+Subproject commit 4bc3852c2aeacef942b8e64e8ba5275ef8e43640