The patch was merged upstream in networking-ovn.

The backport to the OSP-14 has been proposed at https://code.engineering.redhat.com/gerrit/#/c/161493/

Note that this feature will not be backported upstream to the stable branches because it's explicit forbidden in the stable branches guidelines: https://docs.openstack.org/project-team-guide/stable-branches.html#review-guidelines

Blocked by https://bugzilla.redhat.com/show_bug.cgi?id=1683568

Can't verify till I get working puddle with the fix of bz:https://bugzilla.redhat.com/show_bug.cgi?id=1673027
Error during stack creation: ERROR: InvalidSchemaError: : resources.ControllerServiceChain<https://192.168.25.2:13808/v1/AUTH_2e7b20836a7249adbe7d670b6aa8773f/overcloud/common/services.yaml>.resources.ServiceChain<nested_stack>.resources.94<https://192.168.25.2:13808/v1/AUTH_2e7b20836a7249adbe7d670b6aa8773f/overcloud/docker/services/neutron-plugin-ml2.yaml>.resources.NeutronBase<https://192.168.25.2:13808/v1/AUTH_2e7b20836a7249adbe7d670b6aa8773f/overcloud/puppet/services/neutron-plugin-ml2-ovn.yaml>: : Parameter 'NeutronNetworkType' is invalid: Invalid default vlan,flat ("[u'vlan', u'flat']" is not an allowed value [geneve, vlan])

verified:  OpenStack/14.0-RHEL-7/2019-04-05.1/
[root@controller-0 ~]# docker exec -it neutron_api /bin/bash
()[neutron@controller-0 /]$ rpm -qa | grep -i ovn
puppet-ovn-13.3.1-0.20181013120724.38e2e33.el7ost.noarch
python-networking-ovn-5.0.2-0.20190307204430.6a774a0.el7ost.noarch

[root@controller-1 ~]# ovn-nbctl list logical_router_port
_uuid               : 926e725a-19f1-46a4-8a64-a3c800048ad3
enabled             : []
external_ids        : {"neutron:revision_number"="4", "neutron:router_name"="53c31ecb-bda1-46f2-b516-f92a462759d1", "neutron:subnet_ids"="69fed17c-1d65-43c7-8886-961b0c37285f"}
gateway_chassis     : []
ipv6_ra_configs     : {}
mac                 : "fa:16:3e:a5:e2:e1"
name                : "lrp-30c956f1-b009-41b1-acf2-6949f279e499"
networks            : ["192.168.2.1/24"]
options             : {reside-on-redirect-chassis="true"}
peer                : []

_uuid               : 571f3a93-2a3a-4f7e-9655-c0d8b4feedb6
enabled             : []
external_ids        : {"neutron:revision_number"="4", "neutron:router_name"="53c31ecb-bda1-46f2-b516-f92a462759d1", "neutron:subnet_ids"="9752e1fd-4e63-485b-8b9d-ea0915854cee"}
gateway_chassis     : []
ipv6_ra_configs     : {}
mac                 : "fa:16:3e:03:a3:e2"
name                : "lrp-2eb99d2b-1aa8-4628-bec9-5d6d40b24215"
networks            : ["192.168.1.1/24"]
options             : {reside-on-redirect-chassis="true"}
peer                : []

_uuid               : d6da42e7-dcbb-4915-9928-ec519d922250
enabled             : []
external_ids        : {"neutron:revision_number"="100", "neutron:router_name"="53c31ecb-bda1-46f2-b516-f92a462759d1", "neutron:subnet_ids"="5caa1af0-62f0-48ea-b116-b67b94dccf73"}
gateway_chassis     : [8d50a5fc-a189-41d3-a060-10465e221b4d, a8229ff6-682f-42ce-aa20-9680183b86ac, f7f34736-db3b-436f-9b2f-5ea5b9f98eb1]
ipv6_ra_configs     : {}
mac                 : "fa:16:3e:b7:e6:56"
name                : "lrp-8db12780-e904-4384-8f72-edd259187ee6"
networks            : ["10.46.21.220/26"]
options             : {reside-on-redirect-chassis="true"}

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-2019:0950