Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - [cvp-web] Add initial CVP Portal homepage content for release

    JIRA: DOVETAIL-563

    The CVP portal homepage needs to be modified to support launch
    activities. An initial iteration between OPNFV marketing has occurred.
    Attached is a deck that outlines a basic left navigation menu and home
    content.
    We can focus on creating the left navigation and content outlined on
    slide 7. The links for the left navigation aren't all flushed out.
    Please leave Release Information/CVP Registry link href's blank for now
    until we define content for those pages.

    Change-Id: I84b8cfb996d336ef666d5a5f6aaabc0d5eebc37b
    Signed-off-by: grakiss <grakiss.wanglei@huawei.com>