Merge bitcoin/bitcoin#23153: Add an argparse abbreviated mode to --failfast

2198f79 Add an argparse abbreviated mode to --failfast (katesalazar)

Pull request description:

  Happy Hacktoberfest, Bitcoin!

  (this PR doesn't really pursue Hacktoberfest)

ACKs for top commit:
  theStack:
    Tested ACK 2198f79

Tree-SHA512: 9b21b2044107685514dc298b52850206faed7306a714c007f500733b632f3f8e0e64e4785313a0c305e5908ccfc87ad27cda7554ea11630acfeaf658956eeab8

Author: MarcoFalke

test/functional/test_runner.py

@@ -347,7 +347,7 @@ def main():
     parser.add_argument('--keepcache', '-k', action='store_true', help='the default behavior is to flush the cache directory on startup. --keepcache retains the cache from the previous testrun.')
     parser.add_argument('--quiet', '-q', action='store_true', help='only print dots, results summary and failure logs')
     parser.add_argument('--tmpdirprefix', '-t', default=tempfile.gettempdir(), help="Root directory for datadirs")
-    parser.add_argument('--failfast', action='store_true', help='stop execution after the first test failure')
+    parser.add_argument('--failfast', '-F', action='store_true', help='stop execution after the first test failure')
     parser.add_argument('--filter', help='filter scripts to run by regular expression')
 
     args, unknown_args = parser.parse_known_args()