I guess you can tell I am not a fan. But you have to work through it. Good luck.
If the house is sold to an investor, the tenants may not have to move. Plus investors would appreciate having the property already rented and producing an income. Ask the tenants if they have considered purchasing a home yet, and refer them to a lender. It could be a longshot that pays off. I like the previous idea about providing the tenants with an incentive. I will try that in the future.
So, my advice would be find some sort of incentive, and get them to work with you, or don't list it until after they move out.