[3.8] Update libregrtest from master (GH-19516)

* bpo-37531: regrtest now catchs ProcessLookupError (GH-16827)

Fix a warning on a race condition on TestWorkerProcess.kill(): ignore
silently ProcessLookupError rather than logging an useless warning.

(cherry picked from commit a661392f8fb5ac4fc095aa1845d1eb7a25c4e9be)

* bpo-38502: regrtest uses process groups if available (GH-16829)

test.regrtest now uses process groups in the multiprocessing mode
(-jN command line option) if process groups are available: if
os.setsid() and os.killpg() functions are available.

(cherry picked from commit ecb035cd14c11521276343397151929a94018a22)

* bpo-37957: Allow regrtest to receive a file with test (and subtests) to ignore (GH-16989)

When building Python in some uncommon platforms there are some known tests that will fail. Right now, the test suite has the ability to ignore entire tests using the -x option and to receive a filter file using the --matchfile filter. The problem with the --matchfile option is that it receives a file with patterns to accept and when you want to ignore a couple of tests and subtests, is too cumbersome to lists ALL tests that are not the ones that you want to accept and he problem with -x is that is not easy to ignore just a subtests that fail and the whole test needs to be ignored.

For these reasons, add a new option to allow to ignore a list of test and subtests for these situations.

(cherry picked from commit e0cd8aa70a3ce19c3d3712568940aa0cbd9aa97b)

* regrtest: log timeout at startup (GH-19514)

Reduce also worker timeout.

(cherry picked from commit 4cf65a630a8d45bad3fe5cdc4c2632ec64e7ba27)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 76ad335..95b4856 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -287,7 +287,7 @@
 
     def list_cases(self):
         support.verbose = False
-        support.set_match_tests(self.ns.match_tests)
+        support.set_match_tests(self.ns.match_tests, self.ns.ignore_tests)
 
         for test_name in self.selected:
             abstest = get_abs_module(self.ns, test_name)
@@ -394,7 +394,10 @@
 
         save_modules = sys.modules.keys()
 
-        self.log("Run tests sequentially")
+        msg = "Run tests sequentially"
+        if self.ns.timeout:
+            msg += " (timeout: %s)" % format_duration(self.ns.timeout)
+        self.log(msg)
 
         previous_test = None
         for test_index, test_name in enumerate(self.tests, 1):