selftests: tc-testing: remove unused import

Remove this leftover from the times we pre-allocated everything
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20231124154248.315470-6-pctammela@mojatatu.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py

@@ -23,8 +23,6 @@ class SubPlugin(TdcPlugin):
         super().__init__()
 
     def pre_suite(self, testcount, testlist):
-        from itertools import cycle
-
         super().pre_suite(testcount, testlist)
 
     def prepare_test(self, test):