Fixing alarms in poweron/shutdown and added events for flow

Change-Id: Id21128dc0a46f3efd1247e5339d7b2f9cba4c580
diff --git a/internal/bbsim/api/onus_handler.go b/internal/bbsim/api/onus_handler.go
index 330621a..116199a 100644
--- a/internal/bbsim/api/onus_handler.go
+++ b/internal/bbsim/api/onus_handler.go
@@ -19,6 +19,7 @@
 import (
 	"context"
 	"fmt"
+
 	"github.com/opencord/bbsim/api/bbsim"
 	"github.com/opencord/bbsim/internal/bbsim/alarmsim"
 	"github.com/opencord/bbsim/internal/bbsim/devices"
@@ -404,7 +405,7 @@
 	}
 
 	losReq := bbsim.ONUAlarmRequest{
-		AlarmType:    "LossOfSignal",
+		AlarmType:    "ONU_ALARM_LOS",
 		SerialNumber: onu.Sn(),
 		Status:       "off",
 	}
@@ -457,7 +458,7 @@
 	olt := devices.GetOLT()
 
 	dyingGasp := bbsim.ONUAlarmRequest{
-		AlarmType:    "DyingGasp",
+		AlarmType:    "DYING_GASP",
 		SerialNumber: onu.Sn(),
 		Status:       "on",
 	}
@@ -474,7 +475,7 @@
 	}
 
 	losReq := bbsim.ONUAlarmRequest{
-		AlarmType:    "LossOfSignal",
+		AlarmType:    "ONU_ALARM_LOS",
 		SerialNumber: onu.Sn(),
 		Status:       "on",
 	}