Switch from an image view UI to a manifest view UI

We no longer allow viewing individual images, but instead only manifests. This will help with the transition to Clair V3 (which is manifest based) and, eventually, the the new data model (which will also be manifest based)

endpoints/api/test/test_manifest.py

@@ -0,0 +1,22 @@
+import pytest
+
+from data import model
+from endpoints.api.manifest import RepositoryManifest
+from endpoints.api.test.shared import conduct_api_call
+from endpoints.test.shared import client_with_identity
+from test.fixtures import *
+
+def test_repository_manifest(client):
+  with client_with_identity('devtable', client) as cl:
+    tags = model.tag.list_repository_tags('devtable', 'simple')
+    digests = model.tag.get_tag_manifest_digests(tags)
+    for tag in tags:
+      manifest = digests[tag.id]
+      params = {
+        'repository': 'devtable/simple',
+        'manifestref': manifest,
+      }
+      result = conduct_api_call(cl, RepositoryManifest, 'GET', params, None, 200).json
+      assert result['digest'] == manifest
+      assert result['manifest_data']
+      assert result['image']