Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove Matthew Lijun as committer"
  - Remove Matthew Lijun as committer

    Matthew Lijun moved to a new employer which is not a member to OPNFV
    requiring Matthew to sign individual CLA. This has not happened over
    the past weeks which needs us to take action to initiate committer
    removal process.

    Change-Id: I17081aaffae72e01e98814defe062accac0a4739
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d192a19..596bb29 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d192a19493b045ea0cf5f89eaf50a8a8d2434785
+Subproject commit 596bb29a5016c10655a2277876d0eca1dca96cea