test: test name is the last elem, not second

When a test requires node to have parameters passed (--expose-gc) the
test name will be the last element in the command array, not the second.

tools/test.py

@@ -232,7 +232,7 @@ class TapProgressIndicator(SimpleProgressIndicator):
 
   def HasRun(self, output):
     self._done += 1
-    command = basename(output.command[1])
+    command = basename(output.command[-1])
     if output.UnexpectedOutput():
       print 'not ok %i - %s' % (self._done, command)
       for l in output.output.stderr.splitlines():