Created attachment 1220167 [details]
vdsm and engine logs

Description of problem:
When trying to add a direct LUN disk via the REST API, the operation will fail and in the engine.log a NullPointerException is raised:
2016-11-13 17:47:31,418 ERROR [org.ovirt.engine.core.bll.storage.disk.AddDiskCommand] (default task-11) [dfd828c5-14cc-4878-a150-2d6aecde55f0] Error during ValidateFailure.: java.lang.NullPointerException
	at org.ovirt.engine.core.bll.validator.storage.DiskValidator.isUsingScsiReservationValid(DiskValidator.java:101) [bll.jar:]



Version-Release number of selected component (if applicable):
ovirt-engine-4.1.0-0.0.master.20161111231310.gitd12e6f1.el7.centos.noarch


How reproducible:
100%

Steps to Reproduce:
1. Add a direct LUN using REST API:
Send POST command to /api/disks:

Body:
<disk>
    <alias>direct_lun_test</alias>
    <bootable>false</bootable>
    <format>cow</format>
    <interface>virtio_scsi</interface>
    <lun_storage>
        <logical_units>
            <logical_unit id="3514f0c5a5160046f">
                <address>10.35.146.129</address>
                <port>3260</port>
                <target>iqn.2008-05.com.xtremio:xio00153500071-514f0c50023f6c00</target>
            </logical_unit>
        </logical_units>
        <type>iscsi</type>
    </lun_storage>
    <provisioned_size>1073741824</provisioned_size>
</disk>

Response --> 500 Internal Server Error
Body -->
<fault>
    <detail>[General command validation failure.]</detail>
    <reason>Operation Failed</reason>
</fault>

2.
3.

Actual results:


Expected results:


Additional info: