Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[fuel] Run functest hunter against master branch"
  - [fuel] Run functest hunter against master branch

    Fuel has upgraded to OpenStack Rocky on master branch, so in order to
    be in sync with the same version of OpenStack in functest, the
    container with hunter tag must be ran for fuel master jobs.

    Change-Id: I91d7e209847cd74e6f16ff5c9881f1098911e9d9
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c6d685a..2d1096b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c6d685aa45e14d181c48b98d84eb6eb74ccc3215
+Subproject commit 2d1096b33e73d6ae734398266222bd578548e475