Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 4d5d6323801d58ecc338f6209581e15845c47a31
  - Remove common Releng jobs useless in case of Functest

    It has to be removed as arm64 build servers are down.
    Then these useless jobs block all verifications.

    Functest docs are built online which manage branches and versions.
    It removes that falsy duplicate docs (only master).

    Change-Id: Ie6df6d8035a3899e928fd75778b68246de617445
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9392849..4d5d632 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 93928495947d2463bc0bc19ca85592513271f011
+Subproject commit 4d5d6323801d58ecc338f6209581e15845c47a31