Exclude jackson XML from eureka client by default

Any client that wants to can include it back again, but generally
it only causes problems (XML returned from apps instead of
JSON by Spring MVC for instance). In general it only causes problems
for services whose clients use "Accept: application/xml,*/*", for
instance (like a browser).

See gh-306

spring-cloud-netflix-dependencies/pom.xml

@@ -283,6 +283,10 @@
 						<groupId>com.google.code.findbugs</groupId>
 						<artifactId>jsr305</artifactId>
 					</exclusion>
+					<exclusion>
+						<artifactId>jackson-dataformat-xml</artifactId>
+						<groupId>com.fasterxml.jackson.dataformat</groupId>
+					</exclusion>
 				</exclusions>
 			</dependency>
 			<!-- Eureka core dep that is now optional -->

spring-cloud-netflix-eureka-server/pom.xml

@@ -83,6 +83,10 @@
 			<artifactId>javax.inject</artifactId>
 		</dependency>
 		<!-- Eureka deps that are now optional in eureka -->
+		<dependency>
+			<groupId>com.fasterxml.jackson.dataformat</groupId>
+			<artifactId>jackson-dataformat-xml</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>com.thoughtworks.xstream</groupId>
 			<artifactId>xstream</artifactId>

spring-cloud-starter-eureka-server/pom.xml

@@ -40,9 +40,5 @@
 			<groupId>com.netflix.ribbon</groupId>
 			<artifactId>ribbon-eureka</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>com.thoughtworks.xstream</groupId>
-			<artifactId>xstream</artifactId>
-		</dependency>
 	</dependencies>
 </project>