Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/fraser'
  - Fix link speed when link is down at startup.
    
    When link is down at startup, the link_speed returned by DPDK
    is 0. This results in un-optimized latency estimates in gen and lat.
    With this fix, lat and gen do nothing until link_speed is
    properly initialized, and use the right link speed in the fast path.
    
    Change-Id: Id2d14b6966ccfac7cc78db3c5a74e704b42edae7
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
    
  - Support async operation in handle_esp
    
    Change-Id: Ibee77e31c0eb7a0e14e7aa0df092a278dfe75d6b
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
    
  - Add support for reception of jumbo frames
    
    Jumbo frames are now supported through the addition of a "mtu"
    parameter of the port in the config file.
    Setting the mtu to a value higher than 1500 bytes will enable
    the reception of jumbo frames.
    In addition, the rte_eth_dev_set_mtu is now set for all pmds.
    Finally, setting mbuf_size does not set MEMPOOL_F_NO_SPREAD
    anymore. This option was only used for pure debugging.
    
    Big packets can be received using two ways
    - Using multiple "small" mbufs, i.e. around 2K. This is the default.
    - Using one big mbuf holding the whole packet. This can be enabled
      by setting a parameter mbuf_size in the receiving core configuration
    
    Change-Id: Idd60ad31f41c89f9522dff4d894af2696b7a2ea1
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
    
  - 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>
    
  - Add support for multiple GEN tasks running on the same core
    
    resolve memory allocation issue
    
    Change-Id: I90bbf711a6a7a4869e5024c061470d9779839a60
    Signed-off-by: Igor Shaula <igor.shaula@intel.com>
    
  - Add support for crypto on multiple cores
    
    * Experimental, for dpdk-stable-17.05.2
    * New improved ESP decapsulation function
    
    Change-Id: If4862dacb3fcf53e21eb5932a195664f80c7c192
    Signed-off-by: Igor Shaula <igor.shaula@intel.com>
    

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