bitbake: toaster: Add distro selection support

Add the ability to select a distro in the project page,
based on values from the Layer Index. Add a distro selection
page with the add layer feature, based on the add machine
page.

[YOCTO #10632]

(Bitbake rev: a156a4eff67cdc3943494f5be72b96e3db656250)

Signed-off-by: David Reyna <David.Reyna@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/orm/migrations/0017_distro_clone.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orm', '0016_clone_progress'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Distro',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('up_id', models.IntegerField(default=None, null=True)),
+                ('up_date', models.DateTimeField(default=None, null=True)),
+                ('name', models.CharField(max_length=255)),
+                ('description', models.CharField(max_length=255)),
+                ('layer_version', models.ForeignKey(to='orm.Layer_Version')),
+            ],
+        ),
+    ]
+