rb: Switch to dyn generator syntax for testing namespaces


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@668898 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/test/SmallTest.thrift b/test/SmallTest.thrift
index 531bf17..36ee349 100644
--- a/test/SmallTest.thrift
+++ b/test/SmallTest.thrift
@@ -1,5 +1,5 @@
 
-ruby_namespace TestNamespace
+namespace rb TestNamespace
 
 struct Goodbyez {
   1: i32 val = 325;