pkg: Rename imports after making 'pkg' a module

find -name '*.go' | xargs sed --follow-symlinks -i 's|go.etcd.io/etcd/v3/pkg/|go.etcd.io/etcd/pkg/v3/|g'
go fmt ./...

pkg/netutil/netutil.go

@@ -23,7 +23,7 @@ import (
 	"sort"
 	"time"
 
-	"go.etcd.io/etcd/v3/pkg/types"
+	"go.etcd.io/etcd/pkg/v3/types"
 
 	"go.uber.org/zap"
 )

pkg/netutil/routes_linux.go

@@ -24,7 +24,7 @@ import (
 	"sort"
 	"syscall"
 
-	"go.etcd.io/etcd/v3/pkg/cpuutil"
+	"go.etcd.io/etcd/pkg/v3/cpuutil"
 )
 
 var errNoDefaultRoute = fmt.Errorf("could not find default route")