fix upload variable directory

releng.wtpbuilder/scripts/upload/upload.xml

@@ -3,6 +3,14 @@
     default="upload"
     basedir=".">
 
+	<!-- if not set by caller, assign default value. In this case, this must be 
+	set before calling other property files, since it is a variable in those 
+	property files -->
+	
+	 <property
+	      name="site-sub-dir"
+	      value="committers" />
+	
     <!-- = = = standard properties pattern = = = -->
     <!-- 
         Note to be cross-platform, "environment variables" are only appropriate for