Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fine-tuning the juju-epc codebase for better error-handling

    The changes are mostly basic/cosmetic in nature.
     - Add some additional info in loggers.
     - Remove timeout from few commands(such as juju deploy)
     - Add exception logging for few commands(such as juju bootstrap).
     - Change rsync to cp for feature file transfer within ABot.

    Change-Id: Ibeaae17f1c25d04b7830ed42719b70e6c99228cf
    Signed-off-by: soumaya <soumaya.nayek@rebaca.com>