HTTPCLIENT-1123: added @since 4.2 tag

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1181192 13f79535-47bb-0310-9956-ffa450edef68

httpclient/src/main/java/org/apache/http/conn/DnsResolver.java

@@ -32,6 +32,8 @@ import java.net.UnknownHostException;
 /**
  * Users may implement this interface to override the normal DNS lookup offered
  * by the OS.
+ *
+ * @since 4.2
  */
 public interface DnsResolver {
 

httpclient/src/main/java/org/apache/http/impl/conn/DefaultClientConnectionOperator.java

@@ -99,6 +99,8 @@ public class DefaultClientConnectionOperator implements ClientConnectionOperator
      * Creates a new client connection operator for the given scheme registry.
      *
      * @param schemes   the scheme registry
+     *
+     * @since 4.2
      */
     public DefaultClientConnectionOperator(final SchemeRegistry schemes) {
         if (schemes == null) {

httpclient/src/main/java/org/apache/http/impl/conn/InMemoryDnsResolver.java

@@ -38,6 +38,8 @@ import org.apache.http.conn.DnsResolver;
 
 /**
  * In-memory DNS resolver implementation.
+ *
+ * @since 4.2
  */
 public class InMemoryDnsResolver implements DnsResolver {
 

httpclient/src/main/java/org/apache/http/impl/conn/SystemDefaultDnsResolver.java

@@ -34,6 +34,7 @@ import org.apache.http.conn.DnsResolver;
 /**
  * DNS resolver that uses the default OS implementation for resolving host names.
  *
+ * @since 4.2
  */
 public class SystemDefaultDnsResolver implements DnsResolver {