Add license in feature.py
Add license in feature.py

Change-Id: I75f51f216dcbf0db1c563cf381c28efc47241d3c
Signed-off-by: SerenaFeng <382e42c9362c05401b97e548e66ecc0826ab4b31@zte.com.cn>

mywulin/functest,opnfv/functest,opnfv/functest,mywulin/functest