Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Use environment variable for image properties"
  - Use environment variable for image properties

    Use IMG_PROP environment variable to read extra image
    properties.

    Set image_extra_properties for scsi volume types
    without file patch, but using IMG_PROP env variable
    IMG_PROP is defined through releng.

    Image extra_properties will continue to get updates from
    functest config file

    With this change, remove unnecessary parameters from arm patch
    Related to:https://gerrit.opnfv.org/gerrit/#/c/63203/

    JIRA:ARMBAND-402

    Change-Id: I64139240751b1e109bbe24ba32f487ccd98b9a92
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>