Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 1dd281fc7e5d96d585561dd9bdbb90173a698a6a
  - Merge "Enable Cassandra for AAI in minimal ONAP environment"
  - Enable Cassandra for AAI in minimal ONAP environment

    Deployment of AAI component fails unless Cassandra is enabled in the
    cluster [1].

    This patch also adds Cassandra to the list of enabled components and
    fixes minor typos in the documentation.

    [1] https://git.onap.org/aai/oom/tree/requirements.yaml#n23

    Issue-ID: INT-1402
    Change-Id: I5cb57e1909f749bb8d28fac0e5eeb09f6cfe4b33
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>