nfs: remove throws from HostNameMatcher constructor

The exception is never thrown.

Acked-by: Lea Morschel
Target: master

core/src/main/java/org/dcache/nfs/InetAddressMatcher.java

@@ -203,7 +203,7 @@ public abstract class InetAddressMatcher implements Predicate<InetAddress> {
 
     public static class HostNameMatcher extends InetAddressMatcher {
 
-        HostNameMatcher(String hostname) throws UnknownHostException {
+        HostNameMatcher(String hostname) {
             super(hostname);
         }