Description of problem:
Creating a storage pool for Ceph RBD storages and setting it to "autostart" does not cause the pool to start automatically when the libvirtd service is started. 
It can still be started manually, though. 

Version-Release number of selected component (if applicable):
libvirt-8.0.0-10.1.module+el8.7.0+1125+fc135c6d

How reproducible:
always

Steps to Reproduce:
1. Install libvirt package, and an RBD storage cluster. 
2. Create a new pool named `rbd`, with the following XML (for example):
```
<pool type='rbd'>
  <name>rbd</name>
  <uuid>329f5c06-0bae-4dc1-8a72-e3b6ee1bd852</uuid>
  <capacity unit='bytes'>0</capacity>
  <allocation unit='bytes'>0</allocation>
  <available unit='bytes'>0</available>
  <source>
    <host name='mon001.example.de'/>
    <host name='mon002.example.de'/>
    <host name='mon003.example.de'/>
    <name>rbd</name>
    <auth type='ceph' username='libvirt'>
      <secret uuid='207613ac-c9e9-48ff-9c12-c618475e029d'/>
    </auth>
  </source>
</pool>
```
3. Note that a corresponding secret with the cephx auth key needs to exist, too. 
4. Configure that pool to start automatically, via `virsh pool-autostart rbd`. 
5. Confirm the pool can be started fine:
```
# virsh pool-start rbd
Pool rbd started
# virsh pool-list --all
 Name   State    Autostart
----------------------------
 rbd    active   yes
```
6. Reboot the machine or call `systemctl restart libvirtd`. 

Actual results:
Pool stays inactive:
```
# virsh pool-list --all
 Name   State      Autostart
------------------------------
 rbd    inactive   yes
```
However, it can be started manually right away:
```
# virsh pool-start rbd
Pool rbd started
# virsh pool-list --all
 Name   State    Autostart
----------------------------
 rbd    active   yes
```

Expected results:
Pool autostarts, i.e.:
```
# virsh pool-list --all
 Name   State    Autostart
----------------------------
 rbd    active   yes
```

Additional info:
Same config worked fine with RedHat 7.9.