Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Remove one sub test cases from neutron trunk
    
    There is one sub test case that can't work correctly on Mitaka,
    
    neutron.tests.tempest.api.test_trunk.TrunkTestJSON.test_create_update_trunk_with_description
    
    It will get a 'Bad request' error.
    Details: {u'message': u"Unrecognized attribute(s) 'description'",
    u'type': u'HTTPBadRequest', u'detail': u''}.
    
    That's mainly because of that,
    
    For Mitaka, there's only several extension resources that support
    attribute 'description', which is 'security_group_rules', 'security_groups',
    'ports', 'subnets', 'networks', 'routers', 'floatingips' and 'subnetpools'.
    All other extension resources including trunk port can't create with description.
    
    See https://github.com/openstack/neutron/blob/mitaka-eol/neutron/extensions/standardattrdescription.py#L22
    
    For Newton, all subclasses of class 'HasStandardAttributes' support
    the attribute 'description' including class Trunk.
    
    See https://github.com/openstack/neutron/blob/newton-eol/neutron/extensions/standardattrdescription.py#L49,
    https://github.com/openstack/neutron/blob/newton-eol/neutron/db/standard_attr.py#L158
    and
    https://github.com/openstack/neutron/blob/newton-eol/neutron/services/trunk/models.py#L26
    
    JIRA: DOVETAIL-723
    
    Change-Id: Ifdfea7c54a1888d933c8ddd78a6feea1db93368c
    Signed-off-by: xudan <xudan16@huawei.com>
    

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