Update git submodules

Update git submodules

* Update docs/submodules/clover from branch 'master'
  - CI add timeout for k8s+istio deployment

    Issue link:
        https://build.opnfv.org/ci/view/clover/job/clover-daily-deploy-master/13/

    Clover daily job often failed, which is caused by bad network at utc 12:OO.
    (Heavy ci job running in huawei lab at that time.)

    Find another time slot for clover daily job.
        https://gerrit.opnfv.org/gerrit/#/c/54589/

    Change-Id: I0a9eb3ba0c63a3c440627a7af5afb302dbdaebb5
    Signed-off-by: QiLiang <liangqi1@huawei.com>