Updated openstack/openstack
Project: openstack/ceilometer  a536b56e223cc8f0f4b3b5fb350838bb7b02d205
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use common code for migrations

we have paged method defined in migration.py. update all scripts
to use this common code

Change-Id: Ia1a088f5ca9b2ab2f2b76aedb6853c7ff46b81a9