VOL-2153 remove flow_utils.go from voltha-go

Change-Id: I81bdc9ed78e6a6b00a176f9c8366ff56fb7777b0
diff --git a/rw_core/core/device_agent.go b/rw_core/core/device_agent.go
index 4a5274b..c8e07a9 100755
--- a/rw_core/core/device_agent.go
+++ b/rw_core/core/device_agent.go
@@ -19,8 +19,9 @@
 	"context"
 	"fmt"
 	"github.com/gogo/protobuf/proto"
-	fu "github.com/opencord/voltha-go/rw_core/utils"
+	coreutils "github.com/opencord/voltha-go/rw_core/utils"
 	"github.com/opencord/voltha-lib-go/pkg/db/model"
+	fu "github.com/opencord/voltha-lib-go/pkg/flows"
 	"github.com/opencord/voltha-lib-go/pkg/log"
 	ic "github.com/opencord/voltha-protos/go/inter_container"
 	ofp "github.com/opencord/voltha-protos/go/openflow_13"
@@ -323,7 +324,7 @@
 	device.FlowGroups = &voltha.FlowGroups{Items: updatedGroups}
 	go agent.updateDeviceWithoutLockAsync(device, chdB)
 
-	if res := fu.WaitForNilOrErrorResponses(agent.defaultTimeout, chAdapters, chdB); res != nil {
+	if res := coreutils.WaitForNilOrErrorResponses(agent.defaultTimeout, chAdapters, chdB); res != nil {
 		log.Debugw("Failed to get response from adapter[or] DB", log.Fields{"result": res})
 		return status.Errorf(codes.Aborted, "errors-%s", res)
 	}
@@ -414,7 +415,7 @@
 	device.FlowGroups = &voltha.FlowGroups{Items: groupsToKeep}
 	go agent.updateDeviceWithoutLockAsync(device, chdB)
 
-	if res := fu.WaitForNilOrErrorResponses(agent.defaultTimeout, chAdapters, chdB); res != nil {
+	if res := coreutils.WaitForNilOrErrorResponses(agent.defaultTimeout, chAdapters, chdB); res != nil {
 		return status.Errorf(codes.Aborted, "errors-%s", res)
 	}
 	return nil
@@ -522,7 +523,7 @@
 	device.FlowGroups = &voltha.FlowGroups{Items: updatedGroups}
 	go agent.updateDeviceWithoutLockAsync(device, chdB)
 
-	if res := fu.WaitForNilOrErrorResponses(agent.defaultTimeout, chAdapters, chdB); res != nil {
+	if res := coreutils.WaitForNilOrErrorResponses(agent.defaultTimeout, chAdapters, chdB); res != nil {
 		return status.Errorf(codes.Aborted, "errors-%s", res)
 	}
 	return nil