Update git submodules

Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Merge "Add nginx services control functionality"
  - Add nginx services control functionality

    - Modify nginx server template to use clover-controller
    in clover-system namespace for file upload
    - Add ability to set nginx server paths and move uploaded files
    in clover-controller and set/get file upload metadata
    - Add cloverctl commands to set nginx server and lb configurations
    - Add example yaml files to configure nginx server and
    lb v1/v2 from cloverctl
    - Modify service definition for http-lb versions to distinguish
    the two versions for GRPC messaging from clover-controller in SDC
    deployment yaml

    Change-Id: I5c6866c5ff3de358939c58ea8c0bde64a69c6eca
    Signed-off-by: earrage <eddie.arrage@huawei.com>