Check if the driver's dependencies are available.

    .. versionadded:: 2015.8.0

    driver
        The name of the driver.

    dependencies
        The dictionary of dependencies to check.

def check_driver_dependencies(driver, dependencies):
    '''
    Check if the driver's dependencies are available.

    .. versionadded:: 2015.8.0

    driver
        The name of the driver.

    dependencies
        The dictionary of dependencies to check.
    '''
    ret = True
    for key, value in six.iteritems(dependencies):
        if value is False:
            log.warning(
                "Missing dependency: '%s'. The %s driver requires "
                "'%s' to be installed.", key, driver, key
            )
            ret = False

    return ret