Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Euphrates cleaning: remove any reference to aaa vnf"
  - Euphrates cleaning: remove any reference to aaa vnf

    aaa vnf was created in Danube to illustrate the vnf abstraction
    as real implementations are now available and nobody really
    implements a real aaa test case, it is better to remove any reference
    to aaa vnf

    Note modification on the documentation will be done accordingly

    Change-Id: Iab6d96c955a6a7dc178588592382e42d68ec604c
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>