Adds non-loopback hostname and ipAddress lookup.

Also adds a propertySource with those values:
"springCloudClientHostInfo": {
    "spring.cloud.client.hostname": "myhostname",
    "spring.cloud.client.ipAddress": "192.168.2.112"
},

fixes gh-47

spring-cloud-commons/src/main/java/org/springframework/cloud/client/HostInfoEnvironmentPostProcessor.java

@@ -0,0 +1,36 @@
+package org.springframework.cloud.client;
+
+import java.util.LinkedHashMap;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.context.config.ConfigFileEnvironmentPostProcessor;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.cloud.util.InetUtils;
+import org.springframework.core.Ordered;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
+
+/**
+ * @author Spencer Gibb
+ */
+public class HostInfoEnvironmentPostProcessor implements
+		EnvironmentPostProcessor, Ordered {
+
+	// Before ConfigFileApplicationListener
+	private int order = ConfigFileEnvironmentPostProcessor.DEFAULT_ORDER - 1;
+
+	@Override
+	public int getOrder() {
+		return order;
+	}
+
+	@Override
+	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+		InetUtils.HostInfo hostInfo = InetUtils.getFirstNonLoopbackHostInfo();
+		LinkedHashMap<String, Object> map = new LinkedHashMap<>();
+		map.put("spring.cloud.client.hostname", hostInfo.getHostname());
+		map.put("spring.cloud.client.ipAddress", hostInfo.getIpAddress());
+		MapPropertySource propertySource = new MapPropertySource("springCloudClientHostInfo", map);
+		environment.getPropertySources().addLast(propertySource);
+	}
+}

spring-cloud-commons/src/main/java/org/springframework/cloud/util/InetUtils.java

@@ -0,0 +1,81 @@
+package org.springframework.cloud.util;
+
+import lombok.Data;
+import lombok.SneakyThrows;
+import lombok.extern.apachecommons.CommonsLog;
+
+import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.UnknownHostException;
+import java.util.Enumeration;
+
+/**
+ * @author Spencer Gibb
+ */
+@CommonsLog
+public class InetUtils {
+
+	/**
+	 * Find the first non-loopback host info.
+	 * If there were errors return a hostinfo with 'localhost' and '127.0.0.1' for hostname and ipAddress respectively.
+	 */
+	public static HostInfo getFirstNonLoopbackHostInfo() {
+		InetAddress address = getFirstNonLoopbackAddress();
+		if (address != null) {
+			return convert(address);
+		}
+		HostInfo hostInfo = new HostInfo();
+		hostInfo.setHostname("localhost");
+		hostInfo.setIpAddress("127.0.0.1");
+		return hostInfo;
+	}
+
+	/**
+	 * Find the first non-loopback InetAddress
+	 */
+	@SneakyThrows
+	public static InetAddress getFirstNonLoopbackAddress() {
+		try {
+			for (Enumeration<NetworkInterface> enumNic = NetworkInterface.getNetworkInterfaces();
+				 enumNic.hasMoreElements(); ) {
+				NetworkInterface ifc = enumNic.nextElement();
+				if (ifc.isUp()) {
+					for (Enumeration<InetAddress> enumAddr = ifc.getInetAddresses();
+						 enumAddr.hasMoreElements(); ) {
+						InetAddress address = enumAddr.nextElement();
+						if (address instanceof Inet4Address && !address.isLoopbackAddress()) {
+							return address;
+						}
+					}
+				}
+			}
+		}
+		catch (IOException ex) {
+			log.error("Cannot get first non-loopback address", ex);
+		}
+
+		try {
+			return InetAddress.getLocalHost();
+		} catch (UnknownHostException e) {
+			log.warn("Unable to retrieve localhost");
+		}
+
+		return null;
+	}
+
+	public static HostInfo convert(InetAddress address) {
+		HostInfo hostInfo = new HostInfo();
+		hostInfo.setHostname(address.getHostName());
+		hostInfo.setIpAddress(address.getHostAddress());
+		return hostInfo;
+	}
+
+	@Data
+	public static final class HostInfo {
+		public boolean override;
+		private String ipAddress;
+		private String hostname;
+	}
+}

spring-cloud-commons/src/main/resources/META-INF/spring.factories

@@ -3,3 +3,8 @@ org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
 org.springframework.cloud.client.CommonsClientAutoConfiguration,\
 org.springframework.cloud.client.discovery.noop.NoopDiscoveryClientAutoConfiguration,\
 org.springframework.cloud.client.loadbalancer.LoadBalancerAutoConfiguration
+
+
+# Environment Post Processors
+org.springframework.boot.env.EnvironmentPostProcessor=\
+org.springframework.cloud.client.HostInfoEnvironmentPostProcessor