Enable more integration tests for python 3. (#17375)

The test_async test target was updated to accommodate changes in
output buffering behavior in python 3. This change in behavior
may need to be addressed in the future.

test/integration/Makefile

@@ -348,4 +348,4 @@ test_async:
 	ANSIBLE_DEBUG=0 LC_ALL=bogus ansible-playbook test_async.yml -i localhost, -e ansible_connection=ssh -v $(TEST_FLAGS)
 	# Verify that the warning exists by examining debug output.
 	ANSIBLE_DEBUG=1 LC_ALL=bogus ansible-playbook test_async.yml -i localhost, -e ansible_connection=ssh -v $(TEST_FLAGS) \
-	| grep -q 'bash: warning: setlocale: LC_ALL: cannot change locale (bogus)'
+	| grep 'bash: warning: setlocale: LC_ALL: cannot change locale (bogus)' > /dev/null

test/utils/shippable/python3-test-tag-blacklist.txt

@@ -1,7 +1,6 @@
 test_apache2_module
 test_apt
 test_assemble
-test_async
 test_authorized_key
 test_filters
 test_gem

test/utils/shippable/python3-test-target-blacklist.txt

@@ -1,4 +1 @@
 s/ pull / /
-s/ no_log / /
-s/ test_async_conditional / /
-s/ test_binary_modules$/ /