Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Functest Doc: first update for Euphrates - move part of the dev group to the testing document - move reporting into user guide - update logs - introduce alpine - introduce functest API - split documents per chapter"
  - Functest Doc: first update for Euphrates
    - move part of the dev group to the testing document
    - move reporting into user guide
    - update logs
    - introduce alpine
    - introduce functest API
    - split documents per chapter

    Change-Id: I08268091ce50309e891a648333da2054e902bcea
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>