For STUB/FORWARD add an option to select servers in the order of appearance on the policy.STUB/FORWARD list

Currently the choice of forwarding target is always left to the server selection algorithm, which breaks the following setup

zone = policy.todnames({'exaple.com'})
policy.add(policy.suffix(policy.FLAGS({'NO_CACHE'}), zone))
policy.add(policy.suffix(policy.STUB({'<local-resolver>', '<public-resolver>'}), zone))

for the users which were relying on the undocumented behavior that <local-resolver> being first on the list was almost exclusively chosen for the queries when available.

I suggest adding a option to optionally turn off the choice based on RTT estimates and select servers based on the order of appearance on the list.