Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Test case descriptions for SNAPS smoke tests
    
    Adding a high-level description of the SNAPS smoke 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
    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-630
    
    Change-Id: I38b072e29ec4cfe50baf0ac3350ea1a1d3e8d67a
    Signed-off-by: dimitris.tsiolakis <dmts@intracom-telecom.com>
    

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