tests: tag the tests that do not work with multi-worker configuration

If the multi-worker default VPP configuration is triggered by
setting VPP_WORKER_CONFIG="workers 2", some of the tests fail
for various reasons.

It's a substantial number, so this change marks all of the
testsets that have this issue, such that they can be addressed
later independently.

Type: test
Change-Id: I4f77196499edef3300afe7eabef9cbff91f794d3
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

test/test_mpls.py

@@ -3,6 +3,7 @@
 import unittest
 import socket
 
+from framework import tag_fixme_vpp_workers
 from framework import VppTestCase, VppTestRunner
 from vpp_ip import DpoProto, INVALID_INDEX
 from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsRoute, \
@@ -59,6 +60,7 @@ def verify_mpls_stack(tst, rx, mpls_labels):
             rx_mpls = rx_mpls[MPLS].payload
 
 
+@tag_fixme_vpp_workers
 class TestMPLS(VppTestCase):
     """ MPLS Test Case """