Update git submodules

* Update docs/submodules/releng from branch 'master'
  to d99953e5e738d143f2f8eaa91bda04ffb85fd354
  - Merge "[opnfvdocs] Cut moselle branch"
  - [opnfvdocs] Cut moselle branch

    Signed-off-by: Emma Foley <efoley@redhat.com>
    Change-Id: Ie8524773f84b3ff1e9deb012f8533e394b81ab22

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7ba7b24..d99953e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7ba7b24aa972fa10d069e2eef2a4013cf3e0c3a9
+Subproject commit d99953e5e738d143f2f8eaa91bda04ffb85fd354