Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 388698c56ea6ddc4156c20ce8bfe89c6c2f8cad6
  - Merge "[VID] Use mariadb galera common chart"
  - [VID] Use mariadb galera common chart

    Instead of using "own" galera chart, reuse chart placed in common part
    of OOM installation.
    Will ease move to common galera cluster (which is not done by this
    commit).

    Change-Id: I843c89ed4899055e9502268089d0e01f28fe37ae
    Issue-ID: VID-704
    Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>