Merge #12904: [qa] Ensure bitcoind processes are cleaned up when tests end

e36a0c0 [qa] Ensure bitcoind processes are cleaned up when tests end (Suhas Daftuar)

Pull request description:

  When tests fail (such as due to a bug in the test, race condition, etc), it's possible that we could follow code paths that bypass our normal node shutdown that occurs in `TestNode.stop_node`.  Add a destructor to `TestNode` that cleans this up.

Tree-SHA512: 72e04bc21462ebd0cb346fd1fe0540da454acfbad41923a0b06ea2317e9045b68e58f9adb02d8200891aca89a9d03a022eb72282aeb31a3b3afe7c6843a4b450

test/functional/test_framework/test_framework.py

@@ -148,6 +148,8 @@ class BitcoinTestFramework():
             if self.nodes:
                 self.stop_nodes()
         else:
+            for node in self.nodes:
+                node.cleanup_on_exit = False
             self.log.info("Note: bitcoinds were not stopped and may still be running")
 
         if not self.options.nocleanup and not self.options.noshutdown and success != TestStatus.FAILED: