Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Set again run_tests.py's report flag

    It was deleted by the previous change [1]

    [1] https://gerrit.opnfv.org/gerrit/#/c/34137/

    Change-Id: Icfc9b43c30febe21501a9413196cc84f9553ce39
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f141579..ec7db4e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f1415796efec4984962f9817639a5ff2cd9ecd41
+Subproject commit ec7db4e0c399ec6a01441139d6ef9caf93297917