Update git submodules

Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Merge "Initial UI dashboard added for visibility"
  - Initial UI dashboard added for visibility

    - Add foundation, jquery and jquery-ui open source js/css
    packages for skin, layout and AJAX
    - Add plotly and candela js open source graphing packages
    - Build core visibility view and provide toplevel templates,
    headers, menu navigation, etc.
    - Update collector/visibility APIs to align to latest Spark
    analytics and UI requirements
    - Refresh page elements at 5 second interval.
    - Visibility controls to stop continual page refresh and clear
    visibility.
    - Multi-select and update service set to analyze.
    - System count updates for tracing, spans, metrics schemas.
    - Min/max/avg response times per service (aggregate) table.
    - Graphs for: per service request counts, user-agent percentages,
    per service/URL counts, per URL/status code counts, per URL counts
    - Tabs for distinct URLs, status codes, user-agents, upstream cluster,
    operation names, nodeids (service names)
    - Table for metrics counters specified in visibility configuration.
    - Metrics over time scatter plots for tracked metrics.

    Change-Id: Ie3ea12fd32e0274ac52f78becc4a56c4c4134660
    Signed-off-by: earrage <eddie.arrage@huawei.com>