Log tor warnings during 'make test-network-all'

Requires the chutney changes from 21572.
(Otherwise, asks users to upgrade their chutney.)

Implements 21570.

Makefile.am

@@ -54,6 +54,7 @@ TEST_CFLAGS=
 TEST_CPPFLAGS=-DTOR_UNIT_TESTS
 TEST_NETWORK_FLAGS=--hs-multi-client 1
 endif
+TEST_NETWORK_WARNING_FLAGS=--quiet --only-warnings
 
 if LIBFUZZER_ENABLED
 TEST_CFLAGS += -fsanitize-coverage=trace-pc-guard,trace-cmp,trace-div
@@ -135,6 +136,10 @@ test-network-all: need-chutney-path test-driver $(TESTING_TOR_BINARY) src/tools/
 	done; \
 	for f in $$flavors; do \
 		$(SHELL) $(top_srcdir)/test-driver --test-name $$f --log-file $(TEST_NETWORK_ALL_LOG_DIR)/$$f.log --trs-file $(TEST_NETWORK_ALL_LOG_DIR)/$$f.trs $(TEST_NETWORK_ALL_DRIVER_FLAGS) $(top_srcdir)/src/test/test-network.sh --flavor $$f $(TEST_NETWORK_FLAGS); \
+		$(top_srcdir)/src/test/test-network.sh $(TEST_NETWORK_WARNING_FLAGS); \
+		if test $$? -eq 2 ; then \
+			echo "Please update your chutney using 'git pull' to see tor warnings here."; \
+		fi; \
 	done; \
 	echo "Log and result files are available in $(TEST_NETWORK_ALL_LOG_DIR)."; \
 	! grep -q FAIL test_network_log/*.trs

changes/feature21570

@@ -0,0 +1,5 @@
+  o Minor features (testing):
+    - During 'make test-network-all', if tor logs any warnings, ask chutney
+      to output them. Requires a recent version of chutney with the 21572
+      patch.
+      Implements 21570.