Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "Fix command parser"
  - Fix command parser

    Command parser could have been crashing if a wrong core/task was
    used in pkt_size command. For some other commands both an error
    and a warning were printed in case of errors.

    Change-Id: I6648bfca1b5bcde3c6393d49687ed84900326d49
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 7aa26ff..d00ce88 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 7aa26ff208ab6c33f38e49f6d9abea15e6697b8c
+Subproject commit d00ce88ca11ee2730126d2e8bd491361cb491674