Modifying existing DATA interface to class None not working

[Senthil Mukundakumar]

Brief Description
-----------------------
Changing DATA interface to class none is not working

Severity
--------
Major

Steps to Reproduce
--------------------------
Modify data interface to none.

[wrsroot@controller-0 ~(keystone_admin)]$ system host-if-modify -c none compute-0 data0

Expected Behavior
------------------ -------
The interface should be changed from class data to none.

Actual Behavior
---------------------
Modification rejected.
Provider network(s) not supported for non-data interfaces. (None) ({'updated_at': datetime.datetime(2018, 9, 24, 15, 4, 44, 535405, tzinfo=<iso8601.Utc>), 'providernetworks': u'group0-data0', 'ihost_uuid': u'c497305b-60dd-4f3b-8ff9-bf22467636e6', 'id': 16, 'forihostid': 5, 'iftype': u'ethernet', 'uuid': u'2bd5c42f-f2e8-4173-b081-be9728b05d98', 'ipv4_pool': None, 'networks': [], 'ifcapabilities': {}, 'ipv6_pool': None, 'ifname': u'data0', 'ipv4_mode': u'disabled', 'sriov_numvfs': 0, 'used_by': [], 'imac': u'3c:fd:fe:ac:61:6d', 'imtu': 1500, 'uses': [], 'networktype': u'data', 'ipv6_mode': u'disabled', 'created_at': datetime.datetime(2018, 9, 24, 15, 2, 28, 512179, tzinfo=<iso8601.Utc>), 'providernetworksdict': {}, 'ifclass': u'data'})
[wrsroot@controller-0 ~(keystone_admin)]$

Reproducibility
---------------
Reproducible

System Configuration
--------------------
Any

Branch/Pull Time/Commit
-----------------------
StarlingX master as of 2018-09-23_20-18-00

[Ghada Khalil (gkhalil)]

Targeting stx.2018.10; this issue is related to the Generalized Interface and Network Configuration Feature:
https://storyboard.openstack.org/#!/story/2003087
which was recently submitted

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/604893

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/604893
Committed: https://git.openstack.org/cgit/openstack/stx-config/commit/?id=7baa74a278de4b3e99067489ac341fd08ffaa7eb
Submitter: Zuul
Branch: master

commit 7baa74a278de4b3e99067489ac341fd08ffaa7eb
Author: Teresa Ho <email address hidden>
Date: Mon Sep 24 16:16:03 2018 -0400

    Setting interface class from data to none failed

    This update fixes the problem where the interface class
    failed to reset to none.

    Closes-Bug: 1794147

    Change-Id: Idadddb73fdc3c647d0e1c1a27a94227955846338
    Signed-off-by: Teresa Ho <email address hidden>