Fix full database test script to not fail randomly

- Switches database schema creation to alembic, which solves the MySQL issue (and makes sure we test migrations as well)
- Adds a few time.sleep(1) to work around MySQL's second-precision issue when adding items to queues and then immediately retrieving them
- Disables the storage proxy tests when running against non-SQLite databases, as it causes failures with the multiple process and multiple transactions
- Changes initdb to support only populating the database, as well as fixing a few small items around the test data when working with non-SQLite data

initdb.py

@@ -222,8 +222,10 @@ def setup_database_for_testing(testcase, with_storage=False, force_rebuild=False
     logger.debug('Setting up DB for testing.')
 
     # Setup the database.
-    wipe_database()
-    initialize_database()
+    if os.environ.get('SKIP_DB_SCHEMA', '') != 'true':
+      wipe_database()
+      initialize_database()
+
     populate_database(with_storage=with_storage)
 
     models_missing_data = find_models_missing_data()
@@ -414,6 +416,20 @@ def wipe_database():
 def populate_database(minimal=False, with_storage=False):
   logger.debug('Populating the DB with test data.')
 
+  # Note: databases set up with "real" schema (via Alembic) will not have these types
+  # type, so we it here it necessary.
+  try:
+    ImageStorageLocation.get(name='local_eu')
+    ImageStorageLocation.get(name='local_us')
+  except ImageStorageLocation.DoesNotExist:
+    ImageStorageLocation.create(name='local_eu')
+    ImageStorageLocation.create(name='local_us')
+
+  try:
+    NotificationKind.get(name='test_notification')
+  except NotificationKind.DoesNotExist:
+    NotificationKind.create(name='test_notification')
+
   new_user_1 = model.user.create_user('devtable', 'password', 'jschorr@devtable.com')
   new_user_1.verified = True
   new_user_1.stripe_id = TEST_STRIPE_ID
@@ -423,7 +439,7 @@ def populate_database(minimal=False, with_storage=False):
     logger.debug('Skipping most db population because user requested mininal db')
     return
 
-  UserRegion.create(user=new_user_1, location=1)
+  UserRegion.create(user=new_user_1, location=ImageStorageLocation.get(name='local_us'))
   model.release.set_region_release('quay', 'us', 'v0.1.2')
 
   model.user.create_confirm_email_code(new_user_1, new_email='typo@devtable.com')