[net][linux]: remove unused files. go1.11 is not supported now.

net/net_linux.go

@@ -552,7 +552,7 @@ func getProcInodes(root string, pid int32, max int) (map[string][]inodeMap, erro
 		return ret, err
 	}
 	defer f.Close()
-	dirEntries, err := readDir(f, max)
+	dirEntries, err := f.ReadDir(max)
 	if err != nil {
 		return ret, err
 	}

net/net_linux_111.go

@@ -1,12 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-//go:build !go1.16
-
-package net
-
-import (
-	"os"
-)
-
-func readDir(f *os.File, max int) ([]os.FileInfo, error) {
-	return f.Readdir(max)
-}

net/net_linux_116.go

@@ -1,12 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-//go:build go1.16
-
-package net
-
-import (
-	"os"
-)
-
-func readDir(f *os.File, max int) ([]os.DirEntry, error) {
-	return f.ReadDir(max)
-}

net/net_linux_netlink_test.go

@@ -1,20 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-//go:build linux
-
-package net
-
-import "testing"
-
-func BenchmarkGetConnectionsInet(b *testing.B) {
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		Connections("inet")
-	}
-}
-
-func BenchmarkGetConnectionsAll(b *testing.B) {
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		Connections("all")
-	}
-}