[server] Initialize Repository without a tasks manager in ServerMigrationHelper.restore_database()
We don't need a tasks manager here I think. Thus instantiate the Repository
from its class directly instead of using config.repository() which set a tasks
manager.
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*