test: determine path to bitcoin-util in test framework

The path is stored in `self.options.bitcoinutil`, points to
`src/bitcoin-util` by default and can be overrided with the
`BITCOINUTIL` environment variable.

Author: theStack

test/functional/test_framework/test_framework.py

@@ -244,8 +244,14 @@ def setup(self):
             "src",
             "bitcoin-cli" + config["environment"]["EXEEXT"],
         )
+        fname_bitcoinutil = os.path.join(
+            config["environment"]["BUILDDIR"],
+            "src",
+            "bitcoin-util" + config["environment"]["EXEEXT"],
+        )
         self.options.bitcoind = os.getenv("BITCOIND", default=fname_bitcoind)
         self.options.bitcoincli = os.getenv("BITCOINCLI", default=fname_bitcoincli)
+        self.options.bitcoinutil = os.getenv("BITCOINUTIL", default=fname_bitcoinutil)
 
         os.environ['PATH'] = os.pathsep.join([
             os.path.join(config['environment']['BUILDDIR'], 'src'),