Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Docker version misalignment and move some irrelevant messages"
  - Docker version misalignment and move some irrelevant messages

    JIRA: DOVETAIL-437
    JIRA: DOVETAIL-444

    1. Docker client version and server version should be 1.12.3 or later.
    2. If any of them is older than 1.12.3, there will be an ERROR message.
    3. Delete the “rm -rf results” message.

    Change-Id: I0c10cf256ef139cac4d43f36108bf5f3f9da8398
    Signed-off-by: xudan <xudan16@huawei.com>