THRIFT-470. fb303: Use a namespace in Perl gen-code

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@769653 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/contrib/fb303/if/fb303.thrift b/contrib/fb303/if/fb303.thrift
index 288b8a0..66c8315 100644
--- a/contrib/fb303/if/fb303.thrift
+++ b/contrib/fb303/if/fb303.thrift
@@ -23,6 +23,7 @@
 
 namespace java com.facebook.fb303
 namespace cpp facebook.fb303
+namespace perl Facebook.FB303
 
 /**
  * Common status reporting mechanism across all services