migration: Rename abbreviated macro MIG_STATE_* to MIGRATION_STATUS_* Rename all macro MIG_STATE_* to MIGRATION_STATUS_* except "MIG_STATE_ERROR", we rename it to "MIGRATION_STATUS_FAILED" which will match the migration status string 'failed'. Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>