MT#55687 api-preferences.t ignore ncos_set preferences

* there are no API v1 endpoints to create ncos sets, therefore
  the preferences are ignored for now

Change-Id: I07cf80acb2a506de53209ef86e1c3d37f2473457

t/api-rest/api-preferences.t

@@ -200,6 +200,8 @@ sub get_preference_existen_value{
         }
     }elsif($preference->{name}=~/^(adm_)?(cf_)?ncos$/){
         $res = get_fake_data_created_or_data('ncoslevels','level');
+    }elsif($preference->{name}=~/^(adm_)?(cf_)?ncos_set$/){
+        $res = 'no_process';
     }elsif($preference->{name}=~/^(contract_)?sound_set$/){
         if ($api eq 'peeringserver') {
             $res = get_fake_data_created_or_data('orphansoundsets','name');