Bump default idleConnsPerHost to control conns in time_wait (#10653)

This PR fixes a hang which occurs quite commonly at higher concurrency
by allowing following changes

- allowing lower connections in time_wait allows faster socket open's
- lower idle connection timeout to ensure that we let kernel
  reclaim the time_wait connections quickly
- increase somaxconn to 4096 instead of 2048 to allow larger tcp
  syn backlogs.

fixes #10413

cmd/erasure-zones.go

@@ -33,6 +33,7 @@ import (
 	"github.com/minio/minio/cmd/config/storageclass"
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
+	"github.com/minio/minio/pkg/dsync"
 	"github.com/minio/minio/pkg/madmin"
 	"github.com/minio/minio/pkg/sync/errgroup"
 )
@@ -92,6 +93,10 @@ func (z *erasureZones) NewNSLock(ctx context.Context, bucket string, objects ...
 	return z.zones[0].NewNSLock(ctx, bucket, objects...)
 }
 
+func (z *erasureZones) GetAllLockers() []dsync.NetLocker {
+	return z.zones[0].GetAllLockers()
+}
+
 func (z *erasureZones) SetDriveCount() int {
 	return z.zones[0].SetDriveCount()
 }