cluster: fold schedulingPolicy into cluster.settings

Fixes: #49240

Author: alexfernandez

lib/internal/cluster/primary.js

@@ -45,6 +45,7 @@ let ids = 0;
 let initialized = false;
 
 // XXX(bnoordhuis) Fold cluster.schedulingPolicy into cluster.settings?
+// XXX(alexfernandez) Folded cluster.schedulingPolicy into cluster.settings.
 let schedulingPolicy = process.env.NODE_CLUSTER_SCHED_POLICY;
 if (schedulingPolicy === 'rr')
   schedulingPolicy = SCHED_RR;
@@ -65,6 +66,7 @@ cluster.setupPrimary = function(options) {
     exec: process.argv[1],
     execArgv: process.execArgv,
     silent: false,
+    schedulingPolicy: cluster.schedulingPolicy,
     ...cluster.settings,
     ...options,
   };
@@ -86,9 +88,10 @@ cluster.setupPrimary = function(options) {
     return process.nextTick(setupSettingsNT, settings);
 
   initialized = true;
-  schedulingPolicy = cluster.schedulingPolicy;  // Freeze policy.
+  schedulingPolicy = settings.schedulingPolicy;  // Freeze policy.
   assert(schedulingPolicy === SCHED_NONE || schedulingPolicy === SCHED_RR,
-         `Bad cluster.schedulingPolicy: ${schedulingPolicy}`);
+         `Bad settings.schedulingPolicy: ${schedulingPolicy}`);
+  cluster.schedulingPolicy = schedulingPolicy;  // Show to the world.
 
   process.nextTick(setupSettingsNT, settings);