Merge bitcoin/bitcoin#28386: test: remove fixed timeouts from feature_config_args

fbcacd4cf0 test: remove fixed timeouts from feature_config_args (Martin Zumsande)

Pull request description:

  Fixes #28290

  These fixed timeouts aren't affected by the `timeout_factor` option and can therefore cause timeouts in slow environments.
  They are also unnecessary for the test because they measure the wrong thing:
  While there is an internal waiting time of 60s within `ThreadOpenConnections` (beginning only when that thread is started) for fixed seeds querying, the timeouts here don't measure that but the time from startup until a debug log message is encountered, during which many other things happen in init, so they don't make much sense to me in the first place.

ACKs for top commit:
  MarcoFalke:
    lgtm ACK fbcacd4cf0

Tree-SHA512: 7bb3b7db2f9666b1929ffb7773c838ee98b0845569428e5d00ecf5234973d534c4f474e213896c71baabd6096a79347bd21b41a17b130053049714eb8a447c79

test/functional/feature_config_args.py

@@ -249,28 +249,24 @@ class ConfArgsTest(BitcoinTestFramework):
         # No peers.dat exists and -dnsseed=0
         # We expect the node will fallback immediately to fixed seeds
         assert not os.path.exists(os.path.join(default_data_dir, "peers.dat"))
-        start = time.time()
         with self.nodes[0].assert_debug_log(expected_msgs=[
                 "Loaded 0 addresses from peers.dat",
                 "DNS seeding disabled",
                 "Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet) and neither -addnode nor -seednode are provided\n",
         ]):
             self.start_node(0, extra_args=['-dnsseed=0', '-fixedseeds=1'])
-        assert time.time() - start < 60
         self.stop_node(0)
         self.nodes[0].assert_start_raises_init_error(['-dnsseed=1', '-onlynet=i2p', '-i2psam=127.0.0.1:7656'], "Error: Incompatible options: -dnsseed=1 was explicitly specified, but -onlynet forbids connections to IPv4/IPv6")
 
         # No peers.dat exists and dns seeds are disabled.
         # We expect the node will not add fixed seeds when explicitly disabled.
         assert not os.path.exists(os.path.join(default_data_dir, "peers.dat"))
-        start = time.time()
         with self.nodes[0].assert_debug_log(expected_msgs=[
                 "Loaded 0 addresses from peers.dat",
                 "DNS seeding disabled",
                 "Fixed seeds are disabled",
         ]):
             self.start_node(0, extra_args=['-dnsseed=0', '-fixedseeds=0'])
-        assert time.time() - start < 60
         self.stop_node(0)
 
         # No peers.dat exists and -dnsseed=0, but a -addnode is provided