Update git submodules

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