Update git submodules

Update git submodules

* Update docs/submodules/kvmfornfv from branch 'stable/euphrates'
  - Merge "To update vsperf/packet-forwarding configuration files" into stable/euphrates
  - To update vsperf/packet-forwarding configuration files

    This patch is used to update the vsperf configuration files for
    enabling thread binding and to select the loopback application
    for tests with VMs.

    Change-Id: Id561475a56e6b262eb90fcab1b07bfeb51df6147
    Signed-off-by: Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>
    (cherry picked from commit a3216e6d5b03ef9d0333329b95d345847a755f63)