Update git submodules

Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "Add support for comments in configuration variables"
  - Add support for comments in configuration variables

    This feature will enable the possibility to have many cores
    configured in a prox config file, and enable/disable them
    through variables.
    For instance, a [core $var1] section in a config file will
    result in [core 1] if $var1 = 1; the whole section and section
    content will be ignored if $var1=#
    Before this implementation, [#core 1] or [core #] was already
    treated as a commented out section (the whole section was
    commented). But there was no way to define a variable $var = #
    to comment a section through a variable.

    Note that in today's implementation any non numerical
    (except s, h, t, -) characteter in the [core] section header
    (and not only #) will cause the section to be ignored.
    It would probably be better to consider # (as maybe N/A and none)
    as comments, and everything else as error. This is however not
    supported by the change request.

    Change-Id: Id4e2b27a1f9b6d595e0b442dcd971ad44a502031
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>