Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Fix build blocker so downstream jobs can be started

    Change-Id: Ie33bcbbe1d4c4fd2166c8931bd9f135cf4200263
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fab7298..6e6882f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fab7298b91aff6bc262cb4b086e381b38e8af984
+Subproject commit 6e6882fcd2915870289c6612405be3c4e078b484