fix: apisix startup failed due to unix socket not being removed (#363)

Author: AlinsRan

usr/lib/systemd/system/apisix.service

@@ -10,6 +10,7 @@ Wants=network-online.target
 Type=forking
 Restart=on-failure
 WorkingDirectory=/usr/local/apisix
+ExecStartPre=/bin/rm -f /usr/local/apisix/logs/worker_events.sock
 ExecStart=/usr/bin/apisix start
 ExecStop=/usr/bin/apisix stop
 ExecReload=/usr/bin/apisix reload