sort disktypes and disksize by name and size

docs/docs.org

@@ -142,6 +142,7 @@ class DiskType(models.Model):
 
     class Meta:
         verbose_name_plural = "Types of disks"
+        ordering = ['name']
 
 
 class DiskSize(models.Model):
@@ -152,6 +153,7 @@ class DiskSize(models.Model):
 
     class Meta:
         verbose_name_plural = "Disk sizes"
+        ordering = ['size']
 
 
 class Disk(models.Model):