Merge #16646: qa: Run tests with UPnP disabled

b168dd3 Bugfix: QA: Run tests with UPnP disabled (Luke Dashjr)

Pull request description:

  This replaces #16560 by adding `upnp=0` to `bitcoin.conf` rather than passing it to nodes.

  > Needed for builds configured with --enable-upnp-default

  You can test this change using:
  ```bash
  ./configure --enable-upnp-default && make -j6 && test/functional/test_runner.py feature_config_args.py
  ```

  on master the test will fail without this change.

ACKs for top commit:
  practicalswift:
    ACK b168dd3 -- diff looks correct

Tree-SHA512: e639dd480dda2cffa19a679018c4bd7e4bd4d0f5e3001d6b407b833e3c166bde98b201063e267b8e45f8a20b0d53ec8bc028bec806b2357f9a7ba314cc4e2d07

Author: laanwj

test/functional/test_framework/util.py

@@ -293,6 +293,7 @@ def initialize_datadir(dirname, n, chain):
         f.write("discover=0\n")
         f.write("listenonion=0\n")
         f.write("printtoconsole=0\n")
+        f.write("upnp=0\n")
         os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
         os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
     return datadir