Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/fraser'
  - Fix crc offloads.

    When configuring a port, prox configures queue flags.
    For historitical reasons, offloads had to be disabled on
    some pmds.
    There is now an API to query the ports and gets their
    capabilities. This fix sets now the flags based on the capabilities,
    and not the driver name.

    Change-Id: Ic72d15001992f26910f653c70d31e4381fff8089
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>
  - Update Fraser document...

    Change-Id: I4ed02be7ca899db4f8f97355c180a92d69d38d8f
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 4176bb2..4685c59 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 4176bb24508f0cecdf0660251d4a40fc95cc9ee1
+Subproject commit 4685c59ec97927af559b4bf10001d0e07de34702