Update git submodules

Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - Merge "Error corrections and architecture option updates"
  - Error corrections and architecture option updates

    Correction of some errors which are permitting a succesfull build
    in the master following these descriptions: http://docs.opnfv.org/en/latest/how-to-use-docs/include-documentation.html#individual-project-documentation

    Moving the architecture options to the Container4NFV wiki and
    leaving only a reference here.

    Change-Id: I7b4debc90997f8812a5681daa8bfa19f90724cef
    Signed-off-by: Gergely Csatari <gergely.csatari@nokia.com>