Update git submodules

Update git submodules

* Update docs/submodules/kvmfornfv from branch 'stable/euphrates'
  - Execution of Livemigration through Yardstick

    This Patch includes the scripts to execute the live migration test
    using Yardstick and providing the information of VM downtime,
    setuptime,totaltime

    Change-Id: Ibe768adde1e5b2289a716524a274081cca97751d
    Co-Authored by:RajithaY<rajithax.yerrumsetty@intel.com>
    Signed-off-by: Navya <navyax.bathula@intel.com>
    (cherry picked from commit 7ea7eea6dab8c1b40c2626eead4ced80e77f87b9)