Update git submodules

Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "Added missing file: rapidVMs.vms"
  - Added missing file: rapidVMs.vms

    This file describes flavors, flavor meta data and boot info.
    All this info can be defined in the [Default] section and will then be
    used by to create all VMs. This data can also be specified in individual
    VM sections to overule the deault values per VM.

    Change-Id: I9d59208360eacec2790e5c467d7afcbeba301251
    Signed-off-by: Luc Provoost <luc.provoost@intel.com>