Remove message.owner_user_id field and implement db migrations

scnserver/swagger/swagger.json

@@ -2952,8 +2952,6 @@
         "handler.CreateUserKey.body": {
             "type": "object",
             "required": [
-                "all_channels",
-                "channels",
                 "name",
                 "permissions"
             ],
@@ -3574,9 +3572,6 @@
                 "message_id": {
                     "type": "string"
                 },
-                "owner_user_id": {
-                    "type": "string"
-                },
                 "priority": {
                     "type": "integer"
                 },