ggsn,pgw: Expect Multiple-Services-Indicator AVP in Initial CCR

Multiple-Services-Indicator AVP is only meant to be sent in CCR Init.
Let's not expect it in Update nor in Termination CCR, open5gs stopped
sending it there recently in 9948fba05afb8e1b118f0c29a84ffe38c0f21b75.

Change-Id: Ic4d6be4bf28c65817ce912a8be10937db0b5dba9

ggsn_tests/GGSN_Tests.ttcn

@@ -573,7 +573,6 @@ module GGSN_Tests {
 						tr_AVP_SubcrId({tr_AVP_SubcrIdType(END_USER_E164), tr_AVP_SubcrIdData(msisdn)}),
 						tr_AVP_RequestedAction(DIRECT_DEBITING),
 						tr_AVP_3GPP_AoCRequestType,
-						tr_AVP_MultipleServicesIndicator,
 						tr_AVP_Multiple_Services_Credit_Control(content := superset(
 							tr_AVP_Requested_Service_Unit,
 							tr_AVP_Used_Service_Unit,
@@ -621,7 +620,6 @@ module GGSN_Tests {
 						tr_AVP_TerminationCause(?),
 						tr_AVP_RequestedAction(DIRECT_DEBITING),
 						tr_AVP_3GPP_AoCRequestType,
-						tr_AVP_MultipleServicesIndicator,
 						tr_AVP_Multiple_Services_Credit_Control(content := superset(
 							/* tr_AVP_Requested_Service_Unit, Only in INIT and UPDATE */
 							tr_AVP_Used_Service_Unit,

pgw/PGW_Tests.ttcn

@@ -405,7 +405,6 @@ runs on PGW_Session_CT return template (present) PDU_DIAMETER
 					tr_AVP_SubcrId({tr_AVP_SubcrIdType(END_USER_E164), tr_AVP_SubcrIdData(msisdn)}),
 					tr_AVP_RequestedAction(DIRECT_DEBITING),
 					tr_AVP_3GPP_AoCRequestType,
-					tr_AVP_MultipleServicesIndicator,
 					tr_AVP_Multiple_Services_Credit_Control(content := superset(
 						tr_AVP_Requested_Service_Unit,
 						tr_AVP_Used_Service_Unit,
@@ -455,7 +454,6 @@ runs on PGW_Session_CT return template (present) PDU_DIAMETER
 					tr_AVP_TerminationCause(?),
 					tr_AVP_RequestedAction(DIRECT_DEBITING),
 					tr_AVP_3GPP_AoCRequestType,
-					tr_AVP_MultipleServicesIndicator,
 					tr_AVP_Multiple_Services_Credit_Control(content := superset(
 						/* tr_AVP_Requested_Service_Unit, Only in INIT and UPDATE */
 						tr_AVP_Used_Service_Unit,