tiny-test-fw: Increase default expect timeout to 10 seconds

Fix CI failures due to (for example) DHCP lease taking more than 5s to be negotiated.

tools/tiny-test-fw/DUT.py

@@ -259,7 +259,7 @@ class BaseDUT(object):
     :param kwargs: extra args for DUT to create ports
     """
 
-    DEFAULT_EXPECT_TIMEOUT = 5
+    DEFAULT_EXPECT_TIMEOUT = 10
     MAX_EXPECT_FAILURES_TO_SAVED = 10
 
     LOG_THREAD = _LogThread()