[dns] Move Resolver and Query to Resolver sub-namespace

Author: igorw

Query.php Resolver/Query.phpQuery.php renamed to Resolver/Query.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace React\Dns;
+namespace React\Dns\Resolver;
 
 class Query
 {

Resolver.php Resolver/Resolver.phpResolver.php renamed to Resolver/Resolver.php

@@ -1,7 +1,9 @@
 <?php
 
-namespace React\Dns;
+namespace React\Dns\Resolver;
 
+use React\Dns\BadServerException;
+use React\Dns\RecordNotFoundException;
 use React\Dns\Model\Message;
 use React\Dns\Protocol\Parser;
 use React\Dns\Protocol\BinaryDumper;