zdtm.py: Printf maps before diffing them

First -- set cannot be made out of lists (and maps lists contain lists of pairs)
Second -- it is much better to read map diffs in hex, rather than ints (as they
would be if repr-ed by default)
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.py

@@ -607,8 +607,8 @@ def check_visible_state(test, state):
 	if cmp_lists(new[0], state[0]):
 		raise test_fail_exc("fds compare")
 	if cmp_lists(new[1], state[1]):
-		s_new = set(new[1])
-		s_old = set(state[1])
+		s_new = set(map(lambda x: '%x-%x' % (x[0], x[1]), new[1]))
+		s_old = set(map(lambda x: '%x-%x' % (x[0], x[1]), state[1]))
 
 		print "Old maps lost:"
 		print s_old - s_new