Remove the type target from the @CacheControl annotation

`@CacheControl` works only at the method level, and it doesn't much
useful to speficy at the resource level, because resources typically
contain methods with different caching behaviour.

Fixes #2226

dropwizard-jersey/src/main/java/io/dropwizard/jersey/caching/CacheControl.java

@@ -12,7 +12,7 @@
  * the annotated method.
  */
 @Documented
-@Target({ElementType.TYPE, ElementType.METHOD})
+@Target(ElementType.METHOD)
 @Retention(RetentionPolicy.RUNTIME)
 public @interface CacheControl {
     /**