Update tests to only bind to the loopback IP address
Update tests to only bind to the loopback IP address

Prevents dozens of firewall prompts from appearing while running tests

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore