Add "import testing ;"

Author: igaztanaga

test/Jamfile.v2

@@ -11,6 +11,8 @@
 # Boost Software License, Version 1.0. (See accompanying file
 # LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+import testing ;
+
 project
     : requirements
       <library>/boost/iterator//boost_iterator