Upgrade hystrix 1.5.6 (#1388)

Fixes gh-1374

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/pre/FormBodyWrapperFilter.java

@@ -22,16 +22,14 @@ import java.io.OutputStream;
 import java.lang.reflect.Field;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Map.Entry;
 import java.util.Set;
+import java.util.Map.Entry;
 
 import javax.servlet.ServletInputStream;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletRequestWrapper;
 import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.Part;
 
-import org.apache.commons.lang3.StringUtils;
 import org.springframework.core.io.InputStreamResource;
 import org.springframework.core.io.Resource;
 import org.springframework.http.HttpEntity;
@@ -44,6 +42,7 @@ import org.springframework.util.Assert;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 import org.springframework.util.ReflectionUtils;
+import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.multipart.MultipartRequest;
 import org.springframework.web.servlet.DispatcherServlet;
@@ -233,7 +232,7 @@ public class FormBodyWrapperFilter extends ZuulFilter {
 			Set<String> result = new HashSet<>();
 			String query = this.request.getQueryString();
 			if (query != null) {
-				for (String value : StringUtils.split(query, "&")) {
+				for (String value : StringUtils.tokenizeToStringArray(query, "&")) {
 					if (value.contains("=")) {
 						value = value.substring(0, value.indexOf("="));
 					}

spring-cloud-netflix-dependencies/pom.xml

@@ -17,7 +17,7 @@
 		<archaius.version>0.7.4</archaius.version>
 		<eureka.version>1.4.11</eureka.version>
 		<feign.version>9.3.1</feign.version>
-		<hystrix.version>1.5.5</hystrix.version>
+		<hystrix.version>1.5.6</hystrix.version>
 		<ribbon.version>2.2.0</ribbon.version>
 		<servo.version>0.10.1</servo.version>
 		<zuul.version>1.2.2</zuul.version>