Flow add failed

The following error was seen in the log on a flow add after the Voltha Core was restarted (test scenario). This resulted in a flow add failure.

voltha/voltha-voltha-adapter-openonu-df5488d68-62x6n[adapter-open-onu]:

{"level":"error","ts":"2021-06-15T10:39:44.647Z","caller":"onuadaptercore/omci_vlan_config.go:636","msg":"timeout waiting for deletion of cookie in some other rule, just try to continue","instanceId":"voltha-voltha-adapter-openonu-df5488d68-62x6n","pkg":"adaptercoreonu","cookie":82190696496737578,"device-id":"8e33b988-76ef-476d-8d7a-01f40eb2d5fe","stacktrace":"github.com/opencord/voltha-lib-go/v4/pkg/log.clogger.Errorw\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v4/pkg/log/log.go:612\ngithub.com/opencord/voltha-openonu-adapter-go/internal/pkg/onuadaptercore.(*UniVlanConfigFsm).suspendNewRule\n\t/go/src/internal/pkg/onuadaptercore/omci_vlan_config.go:636\ngithub.com/opencord/voltha-openonu-adapter-go/internal/pkg/onuadaptercore.(*UniVlanConfigFsm).SetUniFlowParams\n\t/go/src/internal/pkg/onuadaptercore/omci_vlan_config.go:452\ngithub.com/opencord/voltha-openonu-adapter-go/internal/pkg/onuadaptercore.(*deviceHandler).addFlowItemToUniPort\n\t/go/src/internal/pkg/onuadaptercore/device_handler.go:2909\ngithub.com/opencord/voltha-openonu-adapter-go/internal/pkg/onuadaptercore.(*deviceHandler).FlowUpdateIncremental\n\t/go/src/internal/pkg/onuadaptercore/device_handler.go:724\ngithub.com/opencord/voltha-openonu-adapter-go/internal/pkg/onuadaptercore.(*OpenONUAC).Update_flows_incrementally\n\t/go/src/internal/pkg/onuadaptercore/openonu.go:470\ngithub.com/opencord/voltha-lib-go/v4/pkg/adapters/common.(*RequestHandlerProxy).Update_flows_incrementally\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v4/pkg/adapters/common/request_handler.go:401\nreflect.Value.call\n\t/usr/local/go/src/reflect/value.go:476\nreflect.Value.Call\n\t/usr/local/go/src/reflect/value.go:337\ngithub.com/opencord/voltha-lib-go/v4/pkg/kafka.CallFuncByName\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v4/pkg/kafka/kafka_inter_container_library.go:765\ngithub.com/opencord/voltha-lib-go/v4/pkg/kafka.(*interContainerProxy).handleMessage\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v4/pkg/kafka/kafka_inter_container_library.go:892"}

The full log and test scenarios can be obtained at https://jenkins.opencord.org/view/VOLTHA-2.X-Tests/job/build_onf-demo-pod_1T4GEM_voltha_master_test/444/