Remove useless migration module

Change-Id: I86359c842409e20d239d404313d513cd03f1b20f
Signed-off-by: Julien Danjou <julien@danjou.info>

aodh/storage/sqlalchemy/migration.py

@@ -1,29 +0,0 @@
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-
-
-def paged(query, size=1000):
-    """Page query results
-
-    :param query: the SQLAlchemy query to execute
-    :param size: the max page size
-    return: generator with query data
-    """
-    offset = 0
-    while True:
-        page = query.offset(offset).limit(size).execute()
-        if page.rowcount <= 0:
-            # There are no more rows
-            break
-        for row in page:
-            yield row
-        offset += size