Remove deprecated scheduler_driver settings

In bug https://bugs.launchpad.net/tripleo/+bug/1615035 we fixed the
scheduler_host setting which got deprecated in newton. It seems also the
scheduler_driver settings needs tweaking:

systemctl status openstack-nova-scheduler.service:
2016-09-24 20:24:54.337 15278 WARNING stevedore.named [-] Could not load nova.scheduler.filter_scheduler.FilterScheduler
2016-09-24 20:24:54.338 15278 CRITICAL nova [-] RuntimeError: (u'Cannot load scheduler driver from configuration %(conf)s.',
                              {'conf': 'nova.scheduler.filter_scheduler.FilterScheduler'})

Let's set this to default during the upgrade step. From newton's nova.conf:

  The class of the driver used by the scheduler. This should be chosen
  from one of the entrypoints under the namespace 'nova.scheduler.driver'
  of file 'setup.cfg'. If nothing is specified in this option, the
  'filter_scheduler' is used.

  This option also supports deprecated full Python path to the class to
  be used.  For example, "nova.scheduler.filter_scheduler.FilterScheduler".
  But note: this support will be dropped in the N Release.

Change-Id: Ic384292ad05a57757158995ec4c1a269fe4b00f1
Depends-On: I89124ead8928ff33e6b6907a7c2178169e91f4e6
Closes-Bug: #1627450

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