Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Renaming test cases for better readability
    
    This patchset proposes a new naming scheme for test cases. The ides is
    to replace the current numbered scheme
    
      <testarea>.tc<number>
    
    with:
    
      <testarea>.<capability/test case description>
    
    The motivation for this is that a the numbering does not convey any
    information about what the test case is doing and hides to which test
    case implementation in Functest or Yardstick a test case spec refers.
    
    Note: this patchset has not yet been tested in Dovetail itself. Its goal
    is start a discussion about the naming scheme.
    
    JIRA: DOVETAIL-647
    
    Change-Id: If33b4bf88e451b372c2af10895ff92a87d9d961d
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>
    
  - Split tempest_smoke test case
    
    1. Total number of sub test cases is 119
    2. Remove all 14 object_storage test cases which need swift
    3. Remove 26 test cases already included in osinterop test area
    4. Remove 21 test cases already included in ipv6 test area
    5. Remove 2 scenario test cases already included in tempest test area
    6. Split other 56 test cases into 8 groups
    
    Change-Id: I9eef20593ebf5f69347a2ec3a612c9ebc5a753db
    Signed-off-by: xudan <xudan16@huawei.com>
    

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