Fixes ipv6 formatting in specific scenario

Use getHostAddress() when getHostName() might return a host name which
doesn't need brackets for formatting.

Fixes gh-807

spring-cloud-consul-discovery/src/main/java/org/springframework/cloud/consul/discovery/ConsulServerUtils.java

@@ -55,7 +55,7 @@ public final class ConsulServerUtils {
 		try {
 			InetAddress inetAdr = InetAddress.getByName(address);
 			if (inetAdr instanceof Inet6Address) {
-				return "[" + inetAdr.getHostName() + "]";
+				return "[" + inetAdr.getHostAddress() + "]";
 			}
 			return address;
 		}