Warn on skipped examples test

Change-Id: Ibbfead2ed5e907213c115a11f571e8ee3415a1e3
diff --git a/mininet-test.rules b/mininet-test.rules
index 1130c2d..6b7bc33 100644
--- a/mininet-test.rules
+++ b/mininet-test.rules
@@ -8,9 +8,10 @@
 error /FAILED/
 error /TIMEOUT/
 
-# Warn on exceptions and sub-errors
+# Warn on exceptions, sub-errors, and skipped
 warn /(?i)^exception/
 warn /ERROR/
+warn /\.\.\. skipped/
 
 # Report passed tests in Info
 info /Test.*OK/