ovs-agent fails when configuring 2 datanetworks to the same interface

[Pedro Monteiro Azevedo de Moura Almeida]

Brief Description
-----------------
OVS-Agent fails to setup when there's more than 1 datanetwork for the same interface.
If the deployment manager configuration file is set up like this:

- class: data
      dataNetworks:
      - group0-data0
      - group0-data0b
      name: data0
      platformNetworks: []
      port:
        name: eth1000
      ptpRole: none

then you will get the following error:

2022-05-24 17:19:10.855 1130 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-] Parsing bridge_mappings failed: Value br-phy0 in mapping: 'group0-data0b:br-phy0' not unique. agent terminated!

Also, if you try to create to another bridge mapping to the same interface, you will get:
[root@controller-0 ~]# ovs-vsctl add-br br-phy2
[root@controller-0 ~]# ovs-vsctl list-br
br-int
br-phy0
br-phy1
br-phy2
br-tun
[root@controller-0 ~]# ovs-vsctl add-port br-phy2 eth1000
ovs-vsctl: cannot create a port named eth1000 because a port named eth1000 already exists on bridge br-phy0

Severity
--------
Major

Steps to Reproduce
------------------
1. Install Stx-6.0 w/ the dm-config.yaml set with more than 1 datanetwork on the same interface like [1]
2. Apply stx-openstack
3. The application may or may not apply, but either way, the neutron-ovs-agent pod should die eventually

[1] - class: data
      dataNetworks:
      - group0-data0
      - group0-data0b
      name: data0
      platformNetworks: []
      port:
        name: eth1000
      ptpRole: none

Expected Behavior
------------------
ovs agent running correctly:
openstack neutron-ovs-agent-compute-0-5621f953-hs4zz 1/1 Running 0 4h40m
Actual Behavior
----------------
ovs agent fails to run:
openstack neutron-ovs-agent-compute-0-5621f953-hs4zz 0/1 CrashLoopBackOff 57 4h40m

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

System Configuration
--------------------
AIO Simplex

Branch/Pull Time/Commit
-----------------------
OS="centos"
SW_VERSION="22.02"
BUILD_TARGET="Host Installer"
BUILD_TYPE="Formal"
BUILD_ID="20220420T033744Z"

Last Pass
---------
Unclear

Timestamp/Logs
--------------
[sysadmin@controller-0 ~(keystone_admin)]$ kubectl logs neutron-ovs-agent-controller-1-cab72f56-znbmt -n openstack
+ exec neutron-openvswitch-agent --config-file /etc/neutron/neutron.conf --config-file /tmp/pod-shared/neutron-agent.ini --config-file /tmp/pod-shared/ml2-local-ip.ini --config-file /etc/neutron/plugins/ml2/openvswitch_agent.ini --config-file /etc/neutron/plugins/ml2/ml2_conf.ini
2022-05-24 17:19:03.924 1130 INFO neutron.common.config [-] Logging enabled!
2022-05-24 17:19:03.925 1130 INFO neutron.common.config [-] /var/lib/openstack/bin/neutron-openvswitch-agent version 16.4.3.dev56
2022-05-24 17:19:04.972 1130 INFO neutron.agent.agent_extensions_manager [-] Loaded agent extensions: []
2022-05-24 17:19:07.928 1130 INFO neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native.ovs_bridge [-] Bridge br-int has datapath-ID 000062bb22749042
2022-05-24 17:19:10.855 1130 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [-] Parsing bridge_mappings failed: Value br-phy0 in mapping: 'group0-data0b:br-phy0' not unique. agent terminated!

Test Activity
-------------
Developer Testing