Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 9f81d7d8a025d24f5e159cd8b0ba60f0fae26327
  - Run Functest Benchmarking testcases in parallel

    Change-Id: If1457bc1a4735d5623f4eeaecd4f1a9bba45c1cf
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8946fa1..9f81d7d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8946fa1da3f90206d460eb5415b8f19386bd2ba7
+Subproject commit 9f81d7d8a025d24f5e159cd8b0ba60f0fae26327