Update git submodules

* Update docs/submodules/oom.git from branch 'dublin'
  to e6dd4bdca1fbba259cb2af3b8ef9a39dbf73afa2
  - Merge "Fix .gitmodules (use dublin instead of .)" into dublin
  - Fix .gitmodules (use dublin instead of .)

    Else it fails when doc recursively updates its submodules (double
    levels of submodules).

    It also updates the commit id to the latest changes in dublin.

    Issue-ID: DOC-505

    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: Id5082d6e7c7996a2e725c548cffba018041c9b45

diff --git a/docs/submodules/oom.git b/docs/submodules/oom.git
index 20fa2f2..e6dd4bd 160000 (submodule)
--- a/docs/submodules/oom.git
+++ b/docs/submodules/oom.git
@@ -1 +1 @@
-Subproject commit 20fa2f2b1f682c3c59f98d230684d81a592283f0
+Subproject commit e6dd4bdca1fbba259cb2af3b8ef9a39dbf73afa2