skip IP address when hostname-for-clients has been provided

for cases where client-bind-address is an internal IP address (behind a firewall)
or 0.0.0.0 etc, then adding the IP address to hostname-for-clients specified
value can result in incorrect client behaviour, so skip adding IP address
for such cases

updated FabricServerTest for the above change

Author: Sumedh Wale

gemfire-core/src/main/java/com/gemstone/gemfire/internal/cache/AbstractRegionMap.java

@@ -4130,7 +4130,7 @@ else if (re != null && owner.isUsedForPartitionedRegionBucket()) {
       // No need here to close the region etc, the asynch shutdown thread spawned in diskstore will do
       // Moreover for non tx threads this exception is not expected, for Tx threads let this exception
       // cause rollback
-      assert noTxn;
+      // assert noTxn;
       result = null;
       //owner.handleDiskAccessException(dae, true/* stop bridge servers*/);
       throw dae;

gemfirexd/core/src/main/java/com/pivotal/gemfirexd/internal/engine/fabricservice/FabricServiceImpl.java

@@ -879,6 +879,8 @@ public abstract class NetworkInterfaceImpl implements NetworkInterface,
 
     protected InetAddress inetAddress;
 
+    protected volatile String hostNameForClients;
+
     protected volatile String hostName;
 
     protected int port;
@@ -1100,7 +1102,8 @@ public final String asString() {
     public final String getHostName() {
       final String hostName = getHostNameForClients();
       if (hostName != null) {
-        return hostName;
+        return this.hostNameForClients != null ? this.hostNameForClients
+            : hostName + '/' + this.inetAddress.getHostAddress();
       }
       return "/" + this.inetAddress.getHostAddress();
     }
@@ -1145,6 +1148,7 @@ protected final String setHostNameForClients(Properties networkProps) {
           Attribute.HOSTNAME_FOR_CLIENTS, GfxdConstants.GFXD_PREFIX +
               Attribute.HOSTNAME_FOR_CLIENTS, monitorlite);
       if (host != null) {
+        this.hostNameForClients = host;
         this.hostName = host;
         return host;
       }
@@ -1157,7 +1161,8 @@ protected final String setHostNameForClients(Properties networkProps) {
         try {
           final InetAddress localHost = SocketCreator.getLocalHost();
           if (localHost != null && !localHost.isLoopbackAddress()) {
-            return (this.hostName = getHostFromInetAddress(localHost));
+            this.hostNameForClients = getHostFromInetAddress(localHost);
+            return (this.hostName = this.hostNameForClients);
           }
         } catch (UnknownHostException uhe) {
           // ignored

gemfirexd/tools/src/test/java/com/pivotal/gemfirexd/internal/engine/FabricServerTest.java

@@ -914,7 +914,7 @@ public void testLocatorStartupAPI() throws Exception {
       }
       String netStr = rs.getString(3);
       assertTrue("Unexpected network server address " + netStr,
-          netStr.endsWith("/0.0.0.0[" + netPort + ']'));
+          netStr.endsWith("[" + netPort + ']') && !netStr.contains("/0.0.0.0"));
       assertFalse("expected no more than one row from SYS.MEMBERS", rs.next());
     } finally {
       try {