Dynamically import a module returning a handle to it.

        :param str module_path: The module path
        :rtype: module

def _import_module(self, module_path):
        """Dynamically import a module returning a handle to it.

        :param str module_path: The module path
        :rtype: module

        """
        LOGGER.debug('Importing %s', module_path)
        try:
            return __import__(module_path)
        except ImportError as error:
            LOGGER.critical('Could not import %s: %s', module_path, error)
            return None