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Description of problem:
Disk failed to be created with iscsi-pool on Add Disk page, the iscsi-pool should be gray or the Create New should be gray when choosing iscsi-pool if it's expected not to create new disk with iscsi-pool.


Version-Release number of selected component (if applicable):
cockpit-machines-197-1.el8.noarch
libvirt-dbus-1.2.0-2.module+el8.1.0+2983+b2ae9c0a.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a iscsi-pool and add it in the Storage Pools
2. Prepare a VM, open the Disks tab, click Add Disk
3. Options as following:
Source: Create New
Pool: iscsi-pool
Name: test
Size: 1 GiB
4. Click Add


Actual results:
An error prompt:
Disk failed to be created
Error message: this function is not supported by the connection driver: storage pool does not support volume creation


Expected results:
The disk can be created or the iscsi-pool should be gray or the Create New should be gray when choosing iscsi-pool if it's expected not to create new disk with iscsi-pool.


Additional info:

Fixed in https://github.com/cockpit-project/cockpit/pull/12388

Verified with package:
cockpit-machines-197.1-1.el8.noarch

Steps:
1. Prepare a iscsi-pool and add it in the Storage Pools
2. Prepare a VM, open the Disks tab, click Add Disk
3. Options as following:
Source: Create New
The Pool "iscsi-pool" now is gray and there is a hint saying :
This pool type does not support Storage Volume creation.

So 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, 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-2019:3325