Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Test case descriptions for Neutron Trunk Port tests
    
    Adding a high-level description of the Neutron trunk port tempest tests.
    As agreed on the last Dovetail call, we are aiming for a relatively low
    level of detail and instead point to available documentation. As the
    tempest tests themselves are quite simple of read, this is the best,
    most concise, and up-to-date version of documentation we can find.
    
    JIRA: DOVETAIL-684
    
    Change-Id: I76801b34f974bf7c77fded3ffa5588b7e5b2803c
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>
    

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