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Description of problem:
cockpit-machines is unable to eject an iso file from its virtual cdrom. To free the iso file, one had to poweroff the machine and detaching the cdrom drive itself.

Note that such simple operation (eject a virtual cdrom/iso file) is supported by virt-manager.

Version-Release number of selected component (if applicable):
cockpit-machines 263

How reproducible:
Always

Steps to Reproduce:
1. attach an iso file as a virtual cdrom drive
2. poweron the machine
3. no methods exist to eject iso file.

Actual results:
Can not free an iso file unless poweroff the machine and detaching the virtual cdrom drive itself.

Expected results:
Able to eject a virtual cdrom

Additional info:
None

PR: https://github.com/cockpit-project/cockpit-machines/pull/822

Test Versions:
cockpit-283-1.el8.x86_64
cockpit-machines-283-1.el8.noarch
libvirt-dbus-1.3.0-2.module+el8.8.0+16781+9f4724c2.x86_64

Test Steps:
1 Create a closed VM
2 Attach a CDROM disk
3 Run the VM, click "Eject" of the CDROM 

Test Results:
1 After step 2, there will be an "Eject" button for the CDROM disk
2 After step 3, the source of the CDROM disk is ejected

According to the results, move status to VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (cockpit-machines bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2211

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days