Add support for temp usernames and an interstitial to confirm username

When a user now logs in for the first time for any external auth (LDAP, JWT, Keystone, Github, Google, Dex), they will be presented with a confirmation screen that affords them the opportunity to change their Quay-assigned username.

Addresses most of the user issues around #74

initdb.py

@@ -19,7 +19,7 @@ from data.database import (db, all_models, Role, TeamRole, Visibility, LoginServ
                            ImageStorageTransformation, ImageStorageSignatureKind,
                            ExternalNotificationEvent, ExternalNotificationMethod, NotificationKind,
                            QuayRegion, QuayService, UserRegion, OAuthAuthorizationCode,
-                           ServiceKeyApprovalType, MediaType, LabelSourceType)
+                           ServiceKeyApprovalType, MediaType, LabelSourceType, UserPromptKind)
 from data import model
 from data.queue import WorkQueue
 from app import app, storage as store, tf
@@ -396,6 +396,8 @@ def initialize_database():
   LabelSourceType.create(name='api', mutable=True)
   LabelSourceType.create(name='internal')
 
+  UserPromptKind.create(name='confirm_username')
+
 
 def wipe_database():
   logger.debug('Wiping all data from the DB.')
@@ -781,6 +783,8 @@ def populate_database(minimal=False, with_storage=False):
   fake_queue = WorkQueue('fakequeue', tf)
   fake_queue.put(['canonical', 'job', 'name'], '{}')
 
+  model.user.create_user_prompt(new_user_5, 'confirm_username')
+
   while repositoryactioncounter.count_repository_actions():
     pass