Rename os-config-applier to os-apply-config.

Change-Id: I29a7e5d1851de654b2453910ccb470ee2d2d383c
Reviewed-on: https://review.openstack.org/33213
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: James E. Blair <corvus@inaugust.com>