Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 938f98d9a0ae3390adc75cfdfa7f2334186a4cad
  - Swith to Releng jobs ng

    It avoid many pinned packages installed via pip and
    failing shell scripts useless for Anuket.

    Change-Id: I78f27789dabfc2b9d9edfaf81011155ba7b86699
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index eb90316..938f98d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit eb9031617cb5dbed7fb4e007a0da6dabe3836fe0
+Subproject commit 938f98d9a0ae3390adc75cfdfa7f2334186a4cad