Bump oslo.log to version 4.2.1

There were a couple of versions of oslo.log that were
not backwards-compatible. Now that a fixed version was
released, bump lower-constraints to require it and
remove the temporary workaround.

Change-Id: If38105ceaa48a0520ae8243982b736d0bc99ec3a
Related-bug: #1871840

lower-constraints.txt

@@ -65,7 +65,7 @@ oslo.config==5.2.0
 oslo.context==2.20.0
 oslo.db==4.37.0
 oslo.i18n==3.20.0
-oslo.log==4.1.2
+oslo.log==4.2.1
 oslo.messaging==5.29.0
 oslo.middleware==3.31.0
 oslo.policy==1.30.0

neutron/services/logapi/drivers/openvswitch/ovs_firewall_log.py

@@ -59,8 +59,7 @@ def setup_logging():
                 fmt=cfg.CONF.logging_default_format_string,
                 datefmt=cfg.CONF.log_date_format))
     elif cfg.CONF.use_journal:
-        # TODO(haleyb): remove when oslo.log is fixed, related bug #1871840
-        journal_handler = handlers.OSJournalHandler(facility=None)
+        journal_handler = handlers.OSJournalHandler()
         LOG.logger.addHandler(journal_handler)
     else:
         syslog_handler = handlers.OSSysLogHandler()

requirements.txt

@@ -31,7 +31,7 @@ oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=2.20.0 # Apache-2.0
 oslo.db>=4.37.0 # Apache-2.0
 oslo.i18n>=3.20.0 # Apache-2.0
-oslo.log>=4.1.2 # Apache-2.0
+oslo.log>=4.2.1 # Apache-2.0
 oslo.messaging>=5.29.0 # Apache-2.0
 oslo.middleware>=3.31.0 # Apache-2.0
 oslo.policy>=1.30.0 # Apache-2.0