accept 127.0.0.1 as localhost for host whitelisting (#974)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

ethereum/jsonrpc/src/main/java/tech/pegasys/pantheon/ethereum/jsonrpc/JsonRpcConfiguration.java

@@ -13,6 +13,7 @@
 package tech.pegasys.pantheon.ethereum.jsonrpc;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 
@@ -29,7 +30,7 @@ public class JsonRpcConfiguration {
   private String host;
   private Collection<String> corsAllowedDomains = Collections.emptyList();
   private Collection<RpcApi> rpcApis;
-  private Collection<String> hostsWhitelist = Collections.singletonList("localhost");
+  private Collection<String> hostsWhitelist = Arrays.asList("localhost", "127.0.0.1");;
   private boolean authenticationEnabled = false;
   private String authenticationCredentialsFile;
 

metrics/src/main/java/tech/pegasys/pantheon/metrics/prometheus/MetricsConfiguration.java

@@ -14,6 +14,7 @@ package tech.pegasys.pantheon.metrics.prometheus;
 
 import tech.pegasys.pantheon.metrics.MetricCategory;
 
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.EnumSet;
@@ -38,7 +39,7 @@ public class MetricsConfiguration {
   private String pushHost;
   private int pushInterval;
   private String prometheusJob;
-  private Collection<String> hostsWhitelist = Collections.singletonList("localhost");
+  private Collection<String> hostsWhitelist = Arrays.asList("localhost", "127.0.0.1");
 
   public static MetricsConfiguration createDefault() {
     final MetricsConfiguration metricsConfiguration = new MetricsConfiguration();

pantheon/src/main/java/tech/pegasys/pantheon/cli/PantheonCommand.java

@@ -404,7 +404,7 @@ public class PantheonCommand implements DefaultCommandValues, Runnable {
       paramLabel = "<hostname>[,<hostname>...]... or * or all",
       description =
           "Comma separated list of hostnames to whitelist for JSON-RPC access, or * or all to accept any host (default: ${DEFAULT-VALUE})",
-      defaultValue = "localhost")
+      defaultValue = "localhost,127.0.0.1")
   private final JsonRPCWhitelistHostsProperty hostsWhitelist = new JsonRPCWhitelistHostsProperty();
 
   @Option(