Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/fraser'
  - Support reading inline jumbo frame and dump them

    Add support for pkt_inline of jumbo frames.
    Dump the whole packet, and not a truncated packet. This might
    have a small impact on performance as the memory footprint
    is increased (by ~640K * number of tasks), resulting in potential
    higher DTLB misses.

    Change-Id: I4ed02be7ca899db4f8f97355c180a92d69d39d8f
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
  - Add support for generation of jumbo frames

    Change-Id: I63af4e5c5c01a4412d517e33fc7111481fd0524a
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
  - Support for dpdk-stable-17.11.1 crypto

    Change-Id: I1a4aee3d550d007046be9d1677dd0ad980cb9817
    Signed-off-by: Igor Shaula <igor.shaula@intel.com>
  - Fix memory leak introduced by 4a65cd84

    Change-Id: I937bb38baa51d1902793fa8720a3ea740a583473
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
  - Add support for multiple variables in core definition

    In the [core] definition we were able to use one variable
    such as $core1 in [core $core1] but not [core ${core1}].
    The second syntax is used when we want multiple
    variables such as in [core ${first_core}-${last_core}].
    This second syntax is now supported.

    Change-Id: Ic94b84cb8cf827acb6697789cd180f41c3bdb028
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 667d670..4176bb2 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 667d6706c5d9f870bc362b36b2c237bbf0979247
+Subproject commit 4176bb24508f0cecdf0660251d4a40fc95cc9ee1