Update git submodules

Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "update userguide alignment"
  - update userguide alignment

    Change-Id: Ie938d84d31c2145167fc2b816a02bd8c0a3210ec
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>
  - Remove default section in the createrapid

    Change-Id: Id9c22f92955b64242971ff768a64132451c8350e
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>
  - Splitting the script in 2 parts: createrapid.py and runrapid.py

    The split of the scripts is documented in the README file. The VM also
    runs now devbind.sh with the proper MAC address to bind the dataplane
    interface with the DPDK poll mode driver.

    Change-Id: I3e7a6235379dc80530934376c7799ac3396b5325
    Luc Provoost <luc.provoost@intel.com>
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>