Update git submodules

* Update docs/submodules/releng from branch 'master'
  to d77fe9f7d2e3898fabf77872da3bda419ff881fc
  - Prevent cnf-testsuite to be executed twice in //

    Falco installation logics break multi testing.

    Change-Id: Ib9153d9578884684f3ce00f1da5552f280ab2d3f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b4092c2..d77fe9f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b4092c262c5458a5966b4d13512fc4a9f6faffc5
+Subproject commit d77fe9f7d2e3898fabf77872da3bda419ff881fc