Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Removing outdated patch for Yardstick HA tests

    This patch was needed to modify the timeout values of the HA test cases
    in Yardstick for the Danube release. In Euphrates, the timeout values
    have been fixed upstream, so the patch is not needed anymore. The code
    for applying the patch was already removed in
    https://gerrit.opnfv.org/gerrit/#/c/51997/

    Change-Id: I67cceb57c063378d77f6cbc720bc6464d2be4aed
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>