Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 57aaf2f368e4d9d057d2c58bc938db16f13a3b05
  - Update git submodules

    * Update kubernetes/robot from branch 'master'
      to 51322d3b374588a051b4a5522fbd25ac92ffb328
      - Testsuite R6 RC2 1.6.2 docker for OOM

        Update testsuite version for RC2 frankfurt

        Issue-ID: INT-1550

        Signed-off-by: mrichomme <morgan.richomme@orange.com>
        Change-Id: I78bf8c3558658c11b2fb1fb96908d9209016014b

      - Merge "Subject: Fix heatbridge params for Frankfurt"
      - Subject: Fix heatbridge params for Frankfurt

        Issue-ID: INT-1584

        Signed-off-by: Marco Platania <platania@research.att.com>
        Change-Id: I25c69c9e7849c2aadb1dedb611bb731685379baa