Possible to create a vf interface with the number of SR-IOV vf is 0 or less.

[Joohyun]

Brief Description
-----------------
When creating a vf interface, it is created even if the number of SR-IOV VF is 0 or less.

Severity
--------
Minor

Steps to Reproduce
------------------
Create a vf interface with the number of SR-IOV VF is 0 or less.

Expected Behavior
------------------
Creation failure

Actual Behavior
----------------
Creation success

Reproducibility
---------------
100%

System Configuration
--------------------
All

Branch/Pull Time/Commit
-----------------------
N/A

Last Pass
---------
N/A

Timestamp/Logs
--------------
N/A

Test Activity
-------------
Sanity

Workaround
----------
N/A

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/config/+/850857

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config/+/850857
Committed: https://opendev.org/starlingx/config/commit/d0ebe605dc6ca5940e5d746f656fcccfbd12f0e6
Submitter: "Zuul (22348)"
Branch: master

commit d0ebe605dc6ca5940e5d746f656fcccfbd12f0e6
Author: Joohyun <email address hidden>
Date: Mon Jul 25 16:08:32 2022 +0900

    Disallow with sriov_numvfs is 0 or less when creating vf interface

    When creating a vf interface, it is created even if the number of SR-IOV VFs is
    0 or less.

    Closes-Bug: 1982543

    Test Plan:
    PASS: Create vf interface with the number of SR-IOV VF is 1 and
          succeed in creation
    PASS: Create vf interface with the number of SR-IOV VF is -1 and
          fail in creation

    Signed-off-by: Joohyun <email address hidden>
    Change-Id: I69ccf8d192fb57c54425e1229ee93a864ebf2573