Add option to control resolution timeout.

Author: ioquatix

lib/rubydns/resolver.rb

@@ -91,14 +91,15 @@ def addresses_for(name, resource_class = Resolv::DNS::Resource::IN::A, options =
 name = fully_qualified_name(name)
 
 cache = options.fetch(:cache, {})
-retries = options.fetch(:retries, 5)
+retries = options.fetch(:retries, 10)
+delay = options.fetch(:delay, 0.01)
 
 records = lookup(name, resource_class, cache) do |name, resource_class|
 response = nil
 
 retries.times do |i|
 # Wait 10ms before trying again:
-sleep 0.01 if i > 0
+sleep delay if delay and i > 0
 
 response = query(name, resource_class)