When using the ovn bridge mappings API all the external IDs on the kubernetes nodes OVS local table (ovs-vsctl list open .) are being cleared.

This is clearing the OVN chassis configuration, and thus, breaking the default cluster network.

v2.2.14

Always.

1. Have something provisioned in the external IDs:

```
[root@d7ef906127d3 nmstate-workspace]# ovs-vsctl set open . external_ids:aKey=aVal
[root@d7ef906127d3 nmstate-workspace]# nmstatectl show
...
ovs-db:
  external_ids:
    system-id: a83596ca-95a7-47f2-82d0-068286542426
    ovn-memlimit-lflow-cache-kb: '1048576'
    ovn-openflow-probe-interval: '180'
    hostname: ip-10-0-110-228.us-west-2.compute.internal
    ovn-encap-type: geneve
    ovn-enable-lflow-cache: 'true'
    ovn-is-interconn: 'true'
    ovn-monitor-all: 'true'
    ovn-ofctrl-wait-before-clear: '0'
    ovn-remote-probe-interval: '180000'
    rundir: /var/run/openvswitch
    ovn-encap-ip: 10.0.110.228
    ovn-remote: unix:/var/run/ovn/ovnsb_db.sock
  other_config:
    vlan-limit: '0'
    ovn-chassis-idx-a83596ca-95a7-47f2-82d0-068286542426: ''
    bundle-idle-timeout: '180'
ovn:
  bridge-mappings:
  - localnet: physnet
    state: present
    bridge: br-ex
```

2. Apply a new mapping: 
```
---
ovn:
  bridge-mappings:
  - localnet: net1
    bridge: br-ex
```

The rest of the external IDs keys are gone, along w/ the `other_config` data.

$ nmstatectl show
...
ovs-db: {}
ovn:
  bridge-mappings:
  - localnet: physnet
    state: present
    bridge: br-ex
  - localnet: net1
    state: present
    bridge: br-ex

$ nmstatectl show
...
ovs-db: 
  external_ids:
    system-id: a83596ca-95a7-47f2-82d0-068286542426
    ovn-memlimit-lflow-cache-kb: '1048576'
    ovn-openflow-probe-interval: '180'
    hostname: ip-10-0-110-228.us-west-2.compute.internal
    ovn-encap-type: geneve
    ovn-enable-lflow-cache: 'true'
    ovn-is-interconn: 'true'
    ovn-monitor-all: 'true'
    ovn-ofctrl-wait-before-clear: '0'
    ovn-remote-probe-interval: '180000'
    rundir: /var/run/openvswitch
    ovn-encap-ip: 10.0.110.228
    ovn-remote: unix:/var/run/ovn/ovnsb_db.sock
  other_config:
    vlan-limit: '0'
    ovn-chassis-idx-a83596ca-95a7-47f2-82d0-068286542426: ''
    bundle-idle-timeout: '180' ovn:
  bridge-mappings:
  - localnet: physnet
    state: present
    bridge: br-ex
  - localnet: net1
    state: present
    bridge: br-ex