Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Develop snort IDS and content inspect service
    
    - Initial commit to show potential structure of a sample service
    - This wil be part of a larger sample application currently dubbed
    Service Delivery Controller
    - Docker container needs to be built and employs open-source Linux packages
    - Service is deployable in Istio service mesh using provided yaml
    - Control snort daemon and add custom rules with GRPC messaging
    - Process snort alerts actively and send to redis and upstream service
    mesh components
    - Integrates a web server for better HTTP signature detection
    
    - Improved build script for CI with variables
    - Render k8s yaml snort manifest dynamically with command
    line options
    - Improve snort_client sample script for runtime modifications
    including passing args on CLI, error checking
    - Update nginx proxy interface
    - Added logging to snort server and alert process
    
    Change-Id: Ic56f9fcd9ed21f64b84b85ac8ee280d69af7b7c9
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>
    

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