selftests: tc-testing: remove unnecessary time.sleep

This operation is redundant and it's not stabilizing nor waiting
for anything.
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20231124154248.315470-3-pctammela@mojatatu.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/tc-testing/tdc.py

@@ -497,11 +497,6 @@ def prepare_run(pm, args, testlist):
         pm.call_post_suite(1)
         return emergency_exit_message
 
-    if args.verbose:
-        print('give test rig 2 seconds to stabilize')
-
-    time.sleep(2)
-
 def purge_run(pm, index):
     pm.call_post_suite(index)