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/mobileconfig_test.go

@@ -0,0 +1,33 @@
+package home
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"howett.net/plist"
+)
+
+func TestHandleMobileConfigDot(t *testing.T) {
+	var err error
+
+	var r *http.Request
+	r, err = http.NewRequest(http.MethodGet, "https://example.com:12345/apple/dot.mobileconfig", nil)
+	assert.Nil(t, err)
+
+	w := httptest.NewRecorder()
+
+	handleMobileConfigDot(w, r)
+	assert.Equal(t, http.StatusOK, w.Code)
+
+	var mc MobileConfig
+	_, err = plist.Unmarshal(w.Body.Bytes(), &mc)
+	assert.Nil(t, err)
+
+	if assert.Equal(t, 1, len(mc.PayloadContent)) {
+		assert.Equal(t, "example.com DoT", mc.PayloadContent[0].Name)
+		assert.Equal(t, "example.com DoT", mc.PayloadContent[0].PayloadDisplayName)
+		assert.Equal(t, "example.com", mc.PayloadContent[0].DNSSettings.ServerName)
+	}
+}