Move LDAP code to the backend/ldap subdirectory

backend/composite_values.go → backend/ldap/composite_values.go

-package backend
+package ldapbackend
 
 import (
 	"encoding/base64"

backend/model.go → backend/ldap/model.go

-package backend
+package ldapbackend
 
 import (
 	"context"

backend/model_test.go → backend/ldap/model_test.go

-package backend
+package ldapbackend
 
 import (
 	"context"
@@ -36,7 +36,7 @@ func startServerAndGetUser3(t testing.TB) (func(), as.Backend, *as.RawUser) {
 
 func startServer(t testing.TB) (func(), as.Backend) {
 	stop := ldaptest.StartServer(t, &ldaptest.Config{
-		Dir:  "../ldaptest",
+		Dir:  "../../ldaptest",
 		Port: testLDAPPort,
 		Base: "dc=example,dc=com",
 		LDIFs: []string{
@@ -182,7 +182,7 @@ func TestModel_SearchUser(t *testing.T) {
 
 func TestModel_SetResourceStatus(t *testing.T) {
 	stop := ldaptest.StartServer(t, &ldaptest.Config{
-		Dir:   "../ldaptest",
+		Dir:   "../../ldaptest",
 		Port:  testLDAPPort,
 		Base:  "dc=example,dc=com",
 		LDIFs: []string{"testdata/base.ldif", "testdata/test1.ldif"},
@@ -215,7 +215,7 @@ func TestModel_SetResourceStatus(t *testing.T) {
 
 func TestModel_HasAnyResource(t *testing.T) {
 	stop := ldaptest.StartServer(t, &ldaptest.Config{
-		Dir:   "../ldaptest",
+		Dir:   "../../ldaptest",
 		Port:  testLDAPPort,
 		Base:  "dc=example,dc=com",
 		LDIFs: []string{"testdata/base.ldif", "testdata/test1.ldif"},

backend/resources.go → backend/ldap/resources.go

-package backend
+package ldapbackend
 
 import (
 	"errors"

backend/resources_test.go → backend/ldap/resources_test.go

-package backend
+package ldapbackend
 
 import (
 	"testing"

backend/tx.go → backend/ldap/tx.go

-package backend
+package ldapbackend
 
 import (
 	"context"

backend/util.go → backend/ldap/util.go

-package backend
+package ldapbackend
 
 import (
 	"os"

cmd/accountserver/main.go

@@ -13,7 +13,7 @@ import (
 	"git.autistici.org/ai3/go-common/serverutil"
 	"gopkg.in/yaml.v2"
 
-	"git.autistici.org/ai3/accountserver/backend"
+	ldapbackend "git.autistici.org/ai3/accountserver/backend/ldap"
 	"git.autistici.org/ai3/accountserver/server"
 )
 
@@ -149,7 +149,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	be, err := backend.NewLDAPBackend(
+	be, err := ldapbackend.NewLDAPBackend(
 		config.LDAP.URI,
 		config.LDAP.BindDN,
 		bindPw,