Fix ArrayStoreException caused by JerseyAutoConfiguration again

This is a follow-on from the changes made in 2b7bf3e. In addition to the
problematic use of @ConditionalOnClass that was addressed in 2b7bf3e,
JerseyAutoConfiguration also used @ConditionalOnBean referencing a 
Jersey class. This has the same problem when used on a class that
implements WebApplicationInitializer. Implementing
WebApplicationInitializer causes the class’s annotations to be
introspected during servlet container initialiser processing. If a
@ConditionalOnBean annotation references a Class that cannot be
loaded an ArrayStoreException occurs.

This commit updates JerseyAutoConfiguration to reference ResourceConfig
as a String. This allows it annotations to be introspected without
attempting to load a Jersey class that may not be on the classpath.

Fixes gh-1733
Fixes gh-1719

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfiguration.java

@@ -52,7 +52,7 @@ import org.springframework.web.filter.RequestContextFilter;
 @ConditionalOnClass(name = {
 		"org.glassfish.jersey.server.spring.SpringComponentProvider",
 		"javax.servlet.ServletRegistration" })
-@ConditionalOnBean(ResourceConfig.class)
+@ConditionalOnBean(type = "org.glassfish.jersey.server.ResourceConfig")
 @ConditionalOnWebApplication
 @Order(Ordered.HIGHEST_PRECEDENCE)
 @AutoConfigureBefore(DispatcherServletAutoConfiguration.class)