SpringBeanProcessor: cope with non-public @bean methods

A @Bean-annotated method on a Spring @configuration class does not
have to be public. Previously, when SpringBeanProcessor encountered
a non-public @bean method it would fail to determine the bean's type
and throw an IllegalStateException.

This commit updates SpringBeanProcessor to use
Class.getDeclaredMethods() when looking for the @bean method on a
@configuration class, thereby allowing it to find non-public methods.

jaxrs/resteasy-spring/src/main/java/org/jboss/resteasy/plugins/spring/SpringBeanProcessor.java

@@ -425,7 +425,7 @@ private static Class<?> getBeanClass(String name, BeanDefinition beanDef,
             }
          }
 
-         for (Method method : getBeanClass(factoryClassName).getMethods())
+         for (Method method : getBeanClass(factoryClassName).getDeclaredMethods())
          {
             if (method.getName().equals(factoryMethodName))
             {

jaxrs/resteasy-spring/src/test/java/org/jboss/resteasy/spring/beanprocessor/ResourceConfiguration.java

@@ -21,7 +21,7 @@ public ResteasyRegistration prototypeRegistration()
    }
 
    @Bean
-   public Counter singletonCounter()
+   Counter singletonCounter()
    {
       return new Counter();
    }