Update git submodules

Update git submodules

* Update docs/submodules/kvmfornfv from branch 'stable/euphrates'
  - Merge "To update the documentation for E-release" into stable/euphrates
  - To update the documentation for E-release

    This patch is used for updating the documentation to include the
    features implemented as part of KVMFORNFV E-release.

    Change-Id: I3de63ffbd0761445ec57291c966792ef2932fd72
    Co-Authored by:RajithaY<rajithax.yerrumsetty@intel.com>
    Co-Authored by:Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>
    Co-Authored by:Shravani Paladugula <shravanix.paladugula@intel.com>
    Signed-off-by:Navya <navyax.bathula@intel.com>
    (cherry picked from commit a3923b36b50dbd842ed1151eb5734ba17348b669)