Update git submodules

* Update docs/submodules/dovetail from branch 'stable/fraser'
  - 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>
    (cherry picked from commit 5412c4228f7fed5e04b95b3fb0adb8bd3445b3a8)

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index a5696da..74c2d0e 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit a5696da7e4c1bc36e8ec97bf0db8ef8d5c555e2e
+Subproject commit 74c2d0e7beefe9a9804cc898634054097af851fa