Update git submodules

Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "build: Rename cloned repositories and remove cuse"
  - build: Rename cloned repositories and remove cuse

    VSPERF expects folders to be named a certain way, but this may not be
    the case if another repository is specified via the package-list.mk
    file. One example of this is the DPDK stable repo which gets cloned to
    the "dpdk-stable" directory unless otherwise specified. Thus Makefiles
    were updated to enforce expected folder names.

    Unused configuration related to vHostCuse support was removed.

    Change-Id: Ifa48898d51e96c72e7d740f43cb635d729b2a796
    Signed-off-by: Cian Ferriter <cian.ferriter@intel.com>
    Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
    Reviewed-by: Al Morton <acmorton@att.com>
    Reviewed-by: Christian Trautman <ctrautma@redhat.com>
    Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>
    Reviewed-by: Trevor Cooper <trevor.cooper@intel.com>