Merge #13421: qa: Remove portseed_offset from test runner

fa6edfe qa: Remove portseed_offset from test runner (MarcoFalke)

Pull request description:

  The portseed_offset is no longer needed in the test runner, since we already kill leftover processes (see #12904). This "fixes" #10869 because we deterministically pick ports starting at 11000

Tree-SHA512: 1ee22e19e02acd3afadc7c6a2b391fd3b5cfcec22c0fe194f3207251e7b1264a04e47d90a3ff8be4aca7d0ec33219a2f5855076acb3565291767939bc2f2fa17

Author: laanwj

test/functional/test_runner.py

@@ -419,18 +419,14 @@ def __init__(self, num_tests_parallel, tests_dir, tmpdir, test_list=None, flags=
         self.test_list = test_list
         self.flags = flags
         self.num_running = 0
-        # In case there is a graveyard of zombie bitcoinds, we can apply a
-        # pseudorandom offset to hopefully jump over them.
-        # (625 is PORT_RANGE/MAX_NODES)
-        self.portseed_offset = int(time.time() * 1000) % 625
         self.jobs = []
 
     def get_next(self):
         while self.num_running < self.num_jobs and self.test_list:
             # Add tests
             self.num_running += 1
             test = self.test_list.pop(0)
-            portseed = len(self.test_list) + self.portseed_offset
+            portseed = len(self.test_list)
             portseed_arg = ["--portseed={}".format(portseed)]
             log_stdout = tempfile.SpooledTemporaryFile(max_size=2**16)
             log_stderr = tempfile.SpooledTemporaryFile(max_size=2**16)