cinder: Define backend variables in group_vars/all

The iscsi role derives the cinder-volume/backup inventory groups from
cinder_enabled_backends, but that variable (along with cinder_backends,
cinder_ceph_backends and the cinder_backend_*_name variables) was only
defined in the cinder role defaults. The iscsi play runs before the
cinder play, so the variable is out of scope there and prechecks (and
deploy/reconfigure) fail with:

    'cinder_enabled_backends' is undefined

when a Cinder iSCSI/LVM backend is enabled.

Move these backend variable definitions to group_vars/all/cinder.yml so
they are in scope for every play, including the iscsi role. This also
keeps all cinder backend definitions - including the cinder-backup ceph
backend (cinder_backup_backend_ceph_name, cinder_backup_ceph_backend) -
in one place. All of their dependencies (the enable_cinder_backend_*
flags, cinder_backend_ceph and the ceph_* variables) are already global,
and globals.yml is applied as extra-vars, so operator overrides continue
to take precedence.

Partial-Bug: #2158120
Change-Id: I765f45814382377332ba9f01f1bc52bd4e046170
Signed-off-by: Kari Häkkinen <Kari.Hakkinen@admicom.com>
(cherry picked from commit 2df2ee6e49d0fd58b1781c0b490b019e1936e96b)

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