oncrpc: bind service to localhost during unit testing.

Motivation:

java.net.SocketException: Network is unreachable
	at sun.nio.ch.Net.connect0(Native Method)
	at sun.nio.ch.Net.connect(Net.java:454)
	at sun.nio.ch.Net.connect(Net.java:446)
	at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:648)

Acked-by: Paul Millar
Target: master, 3.0

oncrpc4j-core/src/test/java/org/dcache/oncrpc4j/rpc/TestGitHubIssue56.java

@@ -20,6 +20,7 @@ public void DumpTest() throws IOException, TimeoutException {
                 .withTCP()
                 .withUDP()
                 .withoutAutoPublish()
+                .withBindAddress("127.0.0.1")
                 .withRpcService(new OncRpcProgram(OncRpcPortmap.PORTMAP_PROGRAMM, OncRpcPortmap.PORTMAP_V2), new OncRpcbindServer())
                 .build();
         rpcbindServer.start();
@@ -36,6 +37,7 @@ public void SetUnsetTest() throws IOException, TimeoutException {
         OncRpcSvc rpcbindServer = new OncRpcSvcBuilder()
                 .withTCP()
                 .withUDP()
+                .withBindAddress("127.0.0.1")
                 .withoutAutoPublish()
                 .withRpcService(new OncRpcProgram(OncRpcPortmap.PORTMAP_PROGRAMM, OncRpcPortmap.PORTMAP_V2), new OncRpcbindServer())
                 .build();