[#318] Use log msg from constants

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/middleware/policy.go

@@ -133,7 +133,7 @@ func getPolicyRequest(r *http.Request, frostfsid FrostFSIDInformer, reqType ReqT
 		res = fmt.Sprintf(s3.ResourceFormatS3Bucket, bktName)
 	}
 
-	reqLogOrDefault(r.Context(), log).Debug("policy request", zap.String("action", op),
+	reqLogOrDefault(r.Context(), log).Debug(logs.PolicyRequest, zap.String("action", op),
 		zap.String("resource", res), zap.String("owner", owner))
 
 	return testutil.NewRequest(op, testutil.NewResource(res, nil),

internal/logs/logs.go

@@ -147,4 +147,5 @@ const (
 	SettingsNodeInvalidOwnerKey                          = "settings node: invalid owner key"
 	FailedToSendTransaction                              = "failed to send transaction"
 	SuccessfulAuth                                       = "successful auth"
+	PolicyRequest                                        = "policy request"
 )