Merge bitcoin#27221: test: Default timeout factor to 4 under --valgrind

fa27cf4 test: Default timeout factor to 4 under --valgrind (MarcoFalke)

Pull request description:

  valgrind will incur a slowdown of at least 2, so increase the default timeout factor.

  This should reduce the number of reported issues. See also bitcoin#27112 (comment)

ACKs for top commit:
  fanquake:
    ACK fa27cf4 - I still see at least one actual issue when running the functional tests under `--valgrind` (outside the CI system), but will follow up separately with that. Increasing the timeout here seems fine.

Tree-SHA512: 4467559a3bfd98f5735f300f6ed54c68f951191d65a2b1294d71d72cc5d0864964de562d5dfa0a4855fc541ccb269a538b7aeb3d408d2d012a5369513397c395

test/functional/test_framework/test_framework.py

@@ -120,8 +120,6 @@ def __init__(self):
         self.disable_autoconnect = True
         self.set_test_params()
         assert self.wallet_names is None or len(self.wallet_names) <= self.num_nodes
-        if self.options.timeout_factor == 0 :
-            self.options.timeout_factor = 99999
         self.rpc_timeout = int(self.rpc_timeout * self.options.timeout_factor) # optionally, increase timeout by a factor
 
     def main(self):
@@ -193,14 +191,17 @@ def parse_args(self):
                             help="run nodes under the valgrind memory error detector: expect at least a ~10x slowdown. valgrind 3.14 or later required. Forces --nosandbox.")
         parser.add_argument("--randomseed", type=int,
                             help="set a random seed for deterministically reproducing a previous test run")
-        parser.add_argument('--timeout-factor', dest="timeout_factor", type=float, default=1.0, help='adjust test timeouts by a factor. Setting it to 0 disables all timeouts')
+        parser.add_argument("--timeout-factor", dest="timeout_factor", type=float, help="adjust test timeouts by a factor. Setting it to 0 disables all timeouts")
 
         self.add_options(parser)
         # Running TestShell in a Jupyter notebook causes an additional -f argument
         # To keep TestShell from failing with an "unrecognized argument" error, we add a dummy "-f" argument
         # source: https://stackoverflow.com/questions/48796169/how-to-fix-ipykernel-launcher-py-error-unrecognized-arguments-in-jupyter/56349168#56349168
         parser.add_argument("-f", "--fff", help="a dummy argument to fool ipython", default="1")
         self.options = parser.parse_args()
+        if self.options.timeout_factor == 0:
+            self.options.timeout_factor = 99999
+        self.options.timeout_factor = self.options.timeout_factor or (4 if self.options.valgrind else 1)
         self.options.previous_releases_path = previous_releases_path
 
         config = configparser.ConfigParser()