Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add functest return status in Alpines"
  - Add functest return status in Alpines

    So far we had 2 approaches:

     * return Functest CI status: can be OK even if tests are FAIL
     * return Functest Test status: can be FAIL even if all Functest tests are OK
     (Fail in onboaraded tests)

    A 3rd way is possible thanks to [1].
    We consider only Functest status and Functest tests for the return statement

    the return will be FAIL only if

     * error in the framework
     * error in Functest Tests

    So concretely, if promise, Doctor can be FAIL, if Functest tests are OK, the
    return will be PASS

    [1]: https://gerrit.opnfv.org/gerrit/#/c/42245/

    Change-Id: I6c7fbe99d888e43700ddb2dfc9bfd6cc9bfbaed6
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3fff607..8b40327 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3fff6078e1da277d92db63a8e1681f6204024ae7
+Subproject commit 8b40327653cfc13076f313e7870c5c5f24e336f9