Only check at least one email gpg key (#2266)

* Only require one email (possibly not yet validated)

* Update message error and check validation of commit

* Add integrations tests

* Complete integration for import

* Add pre-check/optimization

* Add some test (not finished)

* Finish

* Fix fixtures

* Fix typo

* Don't guess key ID

models/fixtures/repository.yml

@@ -176,3 +176,15 @@
   lower_name: repo15
   name: repo15
   is_bare: true
+
+-
+  id: 16
+  owner_id: 2
+  lower_name: repo16
+  name: repo16
+  is_private: false
+  num_issues: 0
+  num_closed_issues: 0
+  num_pulls: 0
+  num_closed_pulls: 0
+  num_watches: 0