Rely on ceph.conf settings when cinder backup pool is created

Ceph adds the osd pool default size option on ceph.conf via [1];
this means we don't need to specify the size of this pool if
the same value (same variable) is used (CEPH_REPLICAS).
This change is an attempt of removing the size setting, relying
on the implicit declaration of the value provided by ceph.conf.

[1] https://github.com/openstack/devstack-plugin-ceph/blob/master/devstack/lib/ceph#L425

Change-Id: I5fa2105ceb3b97a4e38926d76c1e4028f1108d4a
1 file changed