Bug 1793550

Description of problem:
When adding SCSI hostdev to VM with one of the next properties scsi_block, scsi_hd or virtio_blk_pci, the actual disk attached to the VM is the local host hard drive (SCSI device is with same provide/model name and also with the same size of host local HD)
Observing VM domain XML shows that the correct scsi_hostdev property is set on the VM.
An examples of VM and host lsscsi command output (for comparison):
- host lsscsi output: 
[root@intel-vfio vdsm]# lsscsi
[0:0:0:0]    disk    ATA      WDC WD10EZEX-60M 1A03  /dev/sda 
[4:0:0:0]    cd/dvd  hp       DVDRAM GUB0N     SA02  /dev/sr0 
[8:0:0:0]    disk    ATA      SAMSUNG MZHPV256 4H0Q  /dev/sdb <-- this one
[9:0:0:0]    disk    KMNRIO   K2               0000  /dev/sdc 
[9:0:0:18]   disk    KMNRIO   K2               0000  /dev/sdh 
.
.

- VM lsscsi output:
[root@localhost ~]# lsscsi
[1:0:0:0]    cd/dvd  QEMU     QEMU DVD-ROM     2.5+  /dev/sr0 
[7:0:0:0]    disk    QEMU     QEMU HARDDISK    2.5+  /dev/sda 
[11:0:0:225] disk    ATA      SAMSUNG MZHPV256 4H0Q  /dev/sdb <-- this one
[root@localhost ~]# 

When using the same SCSI hostdev but with scsi_generic property, the correct SCSI hostdev is attached to the VM:
[root@localhost ~]# lsscsi
[1:0:0:0]    cd/dvd  QEMU     QEMU DVD-ROM     2.5+  /dev/sr0 
[2:0:0:0]    disk    QEMU     QEMU HARDDISK    2.5+  /dev/sda 
[2:0:0:1]    disk    KMNRIO   K2               0000  /dev/sdb 
[root@localhost ~]# 

Version-Release number of selected component (if applicable):
ovirt-engine-4.4.0-0.14.master.el7
vdsm-4.40.0-180.giteba0b75.el8ev.x86_64
libvirt-5.6.0-6.module+el8.1.0+4244+9aa4e6bb.x86_64
qemu-kvm-4.1.0-14.module+el8.1.0+4548+ed1300f4.x86_64
sanlock-3.8.0-2.el8.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Add SCSI domain to data center with some LUNs on it.
2. Browse WebAdmin -> Compute -> VMs -> click on RHEL VM -> host devices and add SCSI device which is related to the LUNs added in step 1.
3. Edit VM -> Custom properties -> select scsi_hostdev key and scsi_block (or one of the other properties except of scsi_generic)
4. Run VM

Actual results:
VM is running with local host HD attached instead of the SCSI hostdev selected.

Expected results:
VM should run with the correct SCSI hostdev attached.

Additional info:
vdsm.log, engine.log, VM dumpxml and VM libvirt.log file
VM name is rhel7l, and the last state in the logs is with scsi_block property.