Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Added unit tests for api_check, health_check, and smoke tests."
  - Added unit tests for api_check, health_check, and smoke tests.

    In addition to the creation of the unit tests, this patch simplifies
    the mocks for connection check as there was an unused annotation.
    This patch also refactors the building of the test suite from the
    constructor to the run() method.

    JIRA: FUNCTEST-813

    Change-Id: I7ff5d0389db36141a33ee3a8f76e04b922f8a95f
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>