THRIFT-479. java: Add javadocs for enum types

Fields now reference their enum class name in javadoc. Also, generated enum classes's members are now javadoc'd.



git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@799128 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/test/ConstantsDemo.thrift b/test/ConstantsDemo.thrift
index 7e97f02..bf414ec 100644
--- a/test/ConstantsDemo.thrift
+++ b/test/ConstantsDemo.thrift
@@ -30,6 +30,7 @@
 }
 
 struct thing2 {
+  /** standard docstring */
   1: enumconstants val = TWO
 }