Issue #11727, issue #11753, issue #11755: disable regrtest timeout

Disable regrtest timeout until #11753 and #11755 are fixed

Lib/test/regrtest.py

@@ -240,7 +240,7 @@ def main(tests=None, testdir=None, verbose=0, quiet=False,
          findleaks=False, use_resources=None, trace=False, coverdir='coverage',
          runleaks=False, huntrleaks=False, verbose2=False, print_slow=False,
          random_seed=None, use_mp=None, verbose3=False, forever=False,
-         header=False, timeout=30*60):
+         header=False, timeout=None):
     """Execute a test suite.
 
     This also parses command-line options and modifies its behavior

Misc/NEWS

@@ -370,9 +370,8 @@ Extensions
 Tests
 -----
 
-- Issue #11727: If a test takes more than 30 minutes, regrtest dumps the
-  traceback of all threads and exits. Use --timeout option to change the
-  default timeout or to disable it.
+- Issue #11727: Add a --timeout option to regrtest: if a test takes more than
+  TIMEOUT seconds, dumps the traceback of all threads and exits.
 
 - Issue #11653: fix -W with -j in regrtest.