Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to b50a6f8961ede94b0851414212d1f38d408dbfde
  - Merge "Set master as branch in .gitmodules"
  - Set master as branch in .gitmodules

    It avoids the next fatal error when updating gitmodules from doc
    (double levels of submodules).

    Submodule (kubernetes/aai) branch configured to inherit branch from
    superproject, but the superproject is not on any branch.

    Issue-ID: DOC-505

    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: Id2d6434210003c20de74fc6da87125c54506cfd1

diff --git a/docs/submodules/oom.git b/docs/submodules/oom.git
index bea7e8b..b50a6f8 160000 (submodule)
--- a/docs/submodules/oom.git
+++ b/docs/submodules/oom.git
@@ -1 +1 @@
-Subproject commit bea7e8b2cffda37f7fc5b6d2391bafcdee5ca207
+Subproject commit b50a6f8961ede94b0851414212d1f38d408dbfde