deprecate resolver-retry-interval and resolver-nonbackoff-tries

deprecate resolver-retry-interval and resolver-nonbackoff-tries

these options control default timing of retries in the resolver
for experimental purposes; they are not known to useful in production
environments.  they will be removed in the future; for now, we
only log a warning if they are used.

(cherry picked from commit 4aaa4f7dca7fee5e62e4554bfbe5ea92f6a4ac6e)