Skip auction for blocked and reserved domains

Closes #1120

app/models/concerns/domain/releasable.rb

@@ -36,7 +36,7 @@ module Concerns
       def release
         if release_to_auction
           transaction do
-            domain_name.sell_at_auction
+            domain_name.sell_at_auction if domain_name.auctionable?
             destroy!
           end
         else

app/models/dns/domain_name.rb

@@ -69,6 +69,10 @@ module DNS
       ReservedDomain.where(name: name).any?
     end
 
+    def auctionable?
+      !not_auctionable?
+    end
+
     def to_s
       name
     end
@@ -77,6 +81,10 @@ module DNS
 
     attr_reader :name
 
+    def not_auctionable?
+      blocked? || reserved?
+    end
+
     def zone_with_same_origin?
       DNS::Zone.where(origin: name).any?
     end