fix: use a different port seed when retrying a failing test

Failures like rpc_mempool_entry_fee_fields_deprecation.py can happen
due to conflicting port usage and retrying with the same port seed will
cause the same failure to repeat

Author: kwvg

test/functional/test_runner.py

@@ -766,7 +766,7 @@ def get_next(self):
                         self.jobs.remove(job)
                         print(f"{name} failed at attempt {attempt}/{self.attempts}, Duration: {int(time.time() - start_time)} s")
                         # start over
-                        portseed_arg = ["--portseed={}".format(portseed)]
+                        portseed_arg = ["--portseed={}".format(portseed + (1000 * attempt))]
                         log_stdout = tempfile.SpooledTemporaryFile(max_size=2**16)
                         log_stderr = tempfile.SpooledTemporaryFile(max_size=2**16)
                         test_argv = name.split()