Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[XCI] Add inventory to run prepare-tests.yml"
  - [XCI] Add inventory to run prepare-tests.yml

    To pass functest healthcheck test in odl scenarios, some odl variables
    must be fetched. To do so, we require to know where opendaylight is
    deployed and that we can know using the dynamic_inventory.py file in OSA

    This is needed for this patch:
    https://gerrit.opnfv.org/gerrit/#/c/63175/

    Change-Id: I04643ce93078bad53838e4d4e611f7684d4bd314
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1c96a8b..0a31ec9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1c96a8bbf28f43b83b0bc3880910ec76d59bea84
+Subproject commit 0a31ec9e8c3dd0e7f99cc7ba4e9201c20a92e28e