Update git submodules

Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "VNFs: rte_eth_dev is deprecated in DPDK version 16.11 and onwards"
  - VNFs: rte_eth_dev is deprecated in DPDK version 16.11 and onwards

    JIRA: SAMPLEVNF-17

    rte_eth_dev is removed in DPDK version 16.11 and onwards.
    The corresponding error handling is fixed through samplevnf
    gerrit 34667.

    This patch is required for migration of VNFs to DPDK ver 17.05.

    Change-Id: I088b705e3261227bcba7332aeb5a2a236e77a33e
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>