Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Do not use capital letters to refer to osa"
  - Do not use capital letters to refer to osa

    As agreed with the releng-xci, we should stop using OSA and start using osa
    to refer to openstack-ansible

    Change-Id: I201b360654b9a52a3387c5e473a3e448a900bb9f
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d9e8c8f..6ebcae5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d9e8c8fef37fe776fe76cb9b722814a265893b4e
+Subproject commit 6ebcae56c76492c4cdf42141a7b60bae1991e6f3