mgr/cephadm: don't mark nvmeof daemons without pool and group in name as stray
Cephadm's naming of these daemons always includes the pool and
group name associated with the nvmeof service. Nvmeof recently
has started to register with the cluster using names that
don't include that, resulting in warnings likes
```
[WRN] CEPHADM_STRAY_DAEMON: 1 stray daemon(s) not managed by cephadm
stray daemon nvmeof.vm-01.hwwhfc on host vm-01 not managed by cephadm
```
where cephadm knew that nvmeof daemon as
```
[ceph: root@vm-00 /]# ceph orch ps --daemon-type nvmeof
NAME HOST PORTS STATUS REFRESHED AGE MEM USE MEM LIM VERSION IMAGE ID
nvmeof.foo.group1.vm-01.hwwhfc vm-01 *:5500,4420,8009,10008 stopped 5m ago 25m - - <unknown> <unknown>
```