Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Set STORAGE_PROTOCOL=ceph if compass

    Change-Id: If5b25041933cb7f16793d440783ec14122f568e4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c93c3de..27e38c7 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c93c3de0e7b8f766bde1bc86f719ad4b247d4f21
+Subproject commit 27e38c7ecfa9642a80b3528ef887a8f8e1857eb0