ceph: use ceph_seq_cmp() to compare migrate_seq
ceph: use ceph_seq_cmp() to compare migrate_seq

Signed-off-by: Yan, Zheng <45e2ee8c8b09e76a9d512320d4eb53c0cd9925c0@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs