Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Update test user guide to improve usability
    
    - Modify hosts.yaml syntax to match patch by Serena
    - Modify result file references for new timestamp patch by Georg
    - Revise online/offline diagrams for OVP name change
    - Add XCF GIMP source files for diagrams with layers for new elements
    
    - New changes for cvp.0.9.0 to ovp.1.0.0
    - Remove reference to bottlenecks container for now
    - Modify section/heading structure
    - Incorporate comments: results.json vs. result files
    - Incorporate comments: online/offline install headings
    - Incorporate comments: remove IP from launch_db.sh
    - Incorporate comments: remove sudo for wget
    - Incorporate comments: pod.yaml for SUT HW info
    - Incorporate comments: test case to config file requirement
    - Incorporate comments: suggested changes to env_config.sh
    
    - Modify the sequence of the guide to reflect installation steps
    - Outline all required configuration files earlier in the guide
    - Highlight configuration file key entries and pitfalls
    - Improve requirements for pod.yaml file for HA
    - Improve online/offline install instructions
    - Call out Dovetail docker run command and explain options
    - Clarify when testapi and local db ports need to be changed
    - Explain the dovetail run --testsuite and --testarea arguments
    more clearly
    - Improve --report option and default result result behavior
    - Make CVP portal a separate section
    - Explain CVP portal workflow to reflect current state of interface
    - Update references to cvp.0.8.0 with cvp.0.9.0
    
    Change-Id: I41857c1b07c211a95f19c99054ca414351c75c20
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>
    

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