admin: Remove obsolete admin router

The admin router has been superseded by the SynnefoRouter of snf_django.

snf-admin-app/synnefo_admin/admin/routers.py

-# Copyright (C) 2010-2014 GRNET S.A.
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-
-"""
-Routers for the admin app. They are used to specify which database will be used
-for each model.
-
-By convention, operations to synnefo.* apps go to 'cyclades' db and operations
-to astakos.* apps go to 'astakos' db.
-"""
-
-
-def select_db(app):
-    """Generic selection of database."""
-    if app == "db":
-        return 'cyclades'
-    if app in ["im", "auth", "sessions", "quotaholder_app"]:
-        return 'astakos'
-    return None
-
-
-class AdminRouter(object):
-
-    """ Router for cyclades/astakos models.
-
-    A router to control database operations on the models of two main apps:
-    synnefo (cyclades) and astakos.
-    """
-
-    def db_for_read(self, model, **hints):
-        """Select db to read."""
-        app = model._meta.app_label
-        return select_db(app)
-
-    def db_for_write(self, model, **hints):
-        """Select db to write."""
-        app = model._meta.app_label
-        return select_db(app)
-
-    # The rest of the methods are ommited since relations and syncing should
-    # affect the admin router.