Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Add improvements to OVP directory and logo upload

    - Formatting changes to directory on home page based
    on OPNFV marketing
    - Updated branding guide link
    - Added test_id field to mongo applications collection
    to associate to approved results for directory
    - Set Test ID from user accounts with administrator
    role in Applications view
    - Provide file upload function for administrator to
    post company logos for OVP directory
    - Company logos are stored and served through tornado
    from cvp-cvpapi container rather than cvp-web

    JIRA: DOVETAIL-663
    JIRA: DOVETAIL-664

    Change-Id: I1226b42883afa2ea2eb5551e3836211abbb94b20
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>