fix checkstyle issue

Author: GabrielBrascher

utils/src/main/java/com/cloud/utils/UriUtils.java

@@ -23,7 +23,6 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
-import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -283,6 +282,9 @@ public static Pair<String, Integer> validateUrl(String format, String url) throw
                 if (hostAddr.isAnyLocalAddress() || hostAddr.isLinkLocalAddress() || hostAddr.isLoopbackAddress() || hostAddr.isMulticastAddress()) {
                     throw new IllegalArgumentException("Illegal host specified in url");
                 }
+                if (hostAddr instanceof Inet6Address) {
+                    throw new IllegalArgumentException("IPV6 addresses not supported (" + hostAddr.getHostAddress() + ")");
+                }
             } catch (UnknownHostException uhe) {
                 throw new IllegalArgumentException("Unable to resolve " + host);
             }