Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Remove neutron trunk test cases with href links

    There is a bug with neutron when using href links to get url.
    This is fixed with Pike.

    This is the patch,
    https://review.openstack.org/#/c/356707/

    These are the related files of Ocata and Pike,
    https://github.com/openstack/neutron/blob/stable/ocata/neutron/api/api_common.py#L68
    https://github.com/openstack/neutron/blob/stable/pike/neutron/api/api_common.py#L95

    There are 2 test cases in neutron trunk related to this.
    Remove these 2 test cases since Dovetail should support 4 versions from M to P.

    Change-Id: I8aac88e4688157def1d6642eaa64bba56dde49ba
    Signed-off-by: xudan <xudan16@huawei.com>