Check if there are any tracked variable inside the result. And keep them for future use.

		:param command_result: command result tot check

		:return:

def __track_vars(self, command_result):
		""" Check if there are any tracked variable inside the result. And keep them for future use.

		:param command_result: command result tot check

		:return:
		"""
		command_env = command_result.environment()
		for var_name in self.tracked_vars():
			if var_name in command_env.keys():
				self.__vars[var_name] = command_env[var_name]