Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Updating the list of OS interop tests

    Updating the list of test cases used in the OpenStack Interop test case
    to match
     i) the tests used in the 2017.09 guideline, and
    ii) the version of Tempest used by Functest

    We keep the explicit list of test cases in the test case definition file
    for now to enable Dovetail to verify the list of executed tests
    corresponds to the tests we want to run.

    JIRA: DOVETAIL-644

    Change-Id: Ic627ef2bbad1dcfa5dd8773301c68dffb545a3b2
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>