Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  to da5c1cb53880220d341ac61e43450aa2ad9949ad
  - Updated OVP2019.12 documentation

    * Added table to index page for relationship between OVP release and OPFNV/ONAP release/tag
    * Added userguide for VNF testing
    * Updated OVP Addendum to include VNF testing
    * Updated release notes to include VNF testing
    * All documentation links point to stable-hunter, not latest
    * Fixed a couple of doc8 warnings for fomatting
    * Updated based on Trevor's review
    * Updated per CVC review and discussions on Feb. 10.
    * Fixed trailing whitespace issues
    * Added missing reference in ovpaddendum/index.rst

    Signed-off-by: Lincoln Lavoie <lylavoie@iol.unh.edu>
    Change-Id: Ibb099bb12873b114f1766d0aaabe4471d390a451