Fix rbac (#7690)

* perf: 优化 suggesstion

* perf: 修改 migrations

apps/terminal/migrations/0044_auto_20220223_1642.py

@@ -1,18 +0,0 @@
-# Generated by Django 3.1.14 on 2022-02-23 08:42
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('terminal', '0043_auto_20220217_2135'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='session',
-            name='protocol',
-            field=models.CharField(choices=[('ssh', 'ssh'), ('rdp', 'rdp'), ('vnc', 'vnc'), ('telnet', 'telnet'), ('mysql', 'mysql'), ('oracle', 'oracle'), ('mariadb', 'mariadb'), ('sqlserver', 'sqlserver'), ('postgresql', 'postgresql'), ('redis', 'redis'), ('mongodb', 'MongoDB'), ('k8s', 'kubernetes')], db_index=True, default='ssh', max_length=16),
-        ),
-    ]