test: Rename bitcoin-util-test.py to util/test_runner.py

To normalize the name of all three test runners (fuzz, functional, util).

test/README.md

@@ -261,7 +261,7 @@ For ways to generate more granular profiles, see the README in
 
 ### Util tests
 
-Util tests can be run locally by running `test/util/bitcoin-util-test.py`.
+Util tests can be run locally by running `test/util/test_runner.py`.
 Use the `-v` option for verbose output.
 
 ### Lint tests

test/config.ini.in

@@ -3,7 +3,7 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 # These environment variables are set by the build process and read by
-# test/functional/test_runner.py and test/util/bitcoin-util-test.py
+# test/*/test_runner.py and test/util/rpcauth-test.py
 
 [environment]
 PACKAGE_NAME=@PACKAGE_NAME@