Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - [ovp-web] Modify OVP home page left-side navigation links

    JIRA: DOVETAIL-579

    Under the 'Governance & Workflow' left-side navigation category:
    Modify 'Overview' link href from:
    https://www.opnfv.org/compliance-verification-program-cvp
    to:
    https://www.opnfv.org/verified
    Modify link text for 'Application Form' to 'Participation Form'
    Modify link href for above from:
    http://docs.opnfv.org/en/latest/submodules/dovetail/docs/testing/user/certificationworkflow/ApplicationForm.html
    to:
    https://na3.docusign.net/Member/PowerFormSigning.aspx?PowerFormId=e03e78d7-c32e-47d3-8292-350b747a0105

    Add another link right below the 'Governance' link named 'Terms & Conditions'. The href for this links is:
    https://www.opnfv.org/wp-content/uploads/sites/12/2018/01/OVP-Terms-and-Conditions-011918.pdf

    Under the 'Training Resources' left-side navigation category:
    Modify link text for 'Dovetail Test Tool User Guide' to 'OVP / Dovetail User Guide'
    Modify link href for above from:
    http://docs.opnfv.org/en/latest/submodules/dovetail/docs/testing/user/userguide/testing_guide.html
    to:
    http://docs.opnfv.org/en/stable-danube/submodules/dovetail/docs/testing/user/userguide/testing_guide.html

    Modify 'Test Specifications' link href from:
    http://docs.opnfv.org/en/latest/submodules/dovetail/docs/testing/user/testspecification/
    to:
    http://docs.opnfv.org/en/stable-danube/submodules/dovetail/docs/testing/user/testspecification/

    Modify 'Dovetail CLI' link href from:
    http://docs.opnfv.org/en/latest/submodules/dovetail/docs/testing/user/userguide/cli_reference.html
    to:
    http://docs.opnfv.org/en/stable-danube/submodules/dovetail/docs/testing/user/userguide/cli_reference.html

    Modify 'OVP Guidelines Addendum' link href from:
    http://docs.opnfv.org/en/latest/submodules/dovetail/docs/testing/user/cvpaddendum/index.html
    to:
    http://docs.opnfv.org/en/stable-danube/submodules/dovetail/docs/testing/user/ovpaddendum/index.html

    Under the 'Release Information' left-side navigation category:

    For the '2018.01 Release Notes' link, specify the href as
    http://docs.opnfv.org/en/stable-danube/submodules/dovetail/docs/release/release-notes/index.html

    Change-Id: Ia4d2cc9f4c3c9874b3c328658bb4bce643aa4c6c
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 5dc6cab..25169c2 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 5dc6cab4205eb298f0494c3c0e9b887658793bcf
+Subproject commit 25169c298818d5d8bd6be1a5d94c9f1b57697972