Pull request: * all: move internal Go packages to internal/

Merge in DNS/adguard-home from 2234-move-to-internal to master

Squashed commit of the following:

commit d26a288cabeac86f9483fab307677b1027c78524
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Fri Oct 30 12:44:18 2020 +0300

    * all: move internal Go packages to internal/

    Closes #2234.

internal/home/auth_glinet_test.go

@@ -0,0 +1,43 @@
+package home
+
+import (
+	"encoding/binary"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAuthGL(t *testing.T) {
+	dir := prepareTestDir()
+	defer func() { _ = os.RemoveAll(dir) }()
+
+	GLMode = true
+	glFilePrefix = dir + "/gl_token_"
+
+	tval := uint32(1)
+	data := make([]byte, 4)
+	if archIsLittleEndian() {
+		binary.LittleEndian.PutUint32(data, tval)
+	} else {
+		binary.BigEndian.PutUint32(data, tval)
+	}
+	assert.Nil(t, ioutil.WriteFile(glFilePrefix+"test", data, 0644))
+	assert.False(t, glCheckToken("test"))
+
+	tval = uint32(time.Now().UTC().Unix() + 60)
+	data = make([]byte, 4)
+	if archIsLittleEndian() {
+		binary.LittleEndian.PutUint32(data, tval)
+	} else {
+		binary.BigEndian.PutUint32(data, tval)
+	}
+	assert.Nil(t, ioutil.WriteFile(glFilePrefix+"test", data, 0644))
+	r, _ := http.NewRequest("GET", "http://localhost/", nil)
+	r.AddCookie(&http.Cookie{Name: glCookieName, Value: "test"})
+	assert.True(t, glProcessCookie(r))
+	GLMode = false
+}