Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 8501d7cee5a887f9e19d5fe3671ef8180bce526b
  - Update git submodules

    * Update kubernetes/robot from branch 'master'
      to bc1480dc6c66d23ed04feaff93fca10da6a65a8f
      - Merge "Use global storage templates for PVC"
      - Use global storage templates for PVC

        OOM has now templates in order to create the needed PVC, using:

        * a PV with a specific class when using a common nfs mount path between
        nodes (sames as today use) --> is the default behavior today
        * or a storage class if we want to use dynamic PV.
          On this case, we use (in order of priority):
          - persistence.storageClassOverride if set on the chart
          - global.persistence.storageClass if set globally
          - persistence.storageClass if set on the chart

        Issue-ID: OOM-1227
        Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
        Change-Id: Ie65e55bca92eb0ada674636f049ecb054b65c5da