Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "https enabled checking"
  - https enabled checking

    JIRA: DOVETAIL-456

    before to check OS_CACERT and OS_INSECURE when using
    https + credential or + no credential,
    there's a need to check if https enabled.
    error log
    https://build.opnfv.org/ci/view/dovetail/job/dovetail-fuel-baremetal-proposed_tests-danube/37/console

    Change-Id: Icdf17541fe6cf64b2f000d424c8d4dcc28cfd371
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>