Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Temporarily disable test_image_signing tests

    They don't pass in two different Queens deployments.
    The topic will continue upstream.

    Change-Id: I43d6b8306aee6934fa1545ec3ed8130bb9b23ee4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Remove logics about Daisy in odl

    Daisy is now setting the right env vars [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/59839/1

    Change-Id: If23c0ac0b5ab2f4f4b9515e27d845cb9c4d07ded
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>