pkg: remove capnslog (#11616)

* pkg: remove capnslog

* CHANGELOG: function signature change

pkg/osutil/interrupt_unix.go

@@ -61,8 +61,6 @@ func HandleInterrupts(lg *zap.Logger) {
 
 		if lg != nil {
 			lg.Info("received signal; shutting down", zap.String("signal", sig.String()))
-		} else {
-			plog.Noticef("received %v signal, shutting down...", sig)
 		}
 
 		for _, h := range ihs {

pkg/osutil/osutil.go

@@ -18,13 +18,9 @@ package osutil
 import (
 	"os"
 	"strings"
-
-	"github.com/coreos/pkg/capnslog"
 )
 
 var (
-	plog = capnslog.NewPackageLogger("go.etcd.io/etcd", "pkg/osutil")
-
 	// support to override setting SIG_DFL so tests don't terminate early
 	setDflSignal = dflSignal
 )