Revert "ref(api): split api models into a class per file"

This reverts commit 004767d3327396af445b307cfb8de5deaccf98d0.

Author: mboersma

rootfs/api/admin.py

@@ -9,7 +9,13 @@
 from django.contrib import admin
 from guardian.admin import GuardedModelAdmin
 
-from .models import App, Build, Config, Container, Domain, Key, Release
+from .models import App
+from .models import Build
+from .models import Config
+from .models import Container
+from .models import Domain
+from .models import Key
+from .models import Release
 
 
 class AppAdmin(GuardedModelAdmin):