MicroOVN with SSL breaks nbctl on >3 machines

[Max Asnaashari]

The recent addition of SSL to MicroOVN seems to cause issues with `ovn-nbctl` when there are more than 3 nodes in the cluster:
```
cat /var/snap/microovn/common/data/ovn.env
# Generated by MicroOVN, DO NOT EDIT.
OVN_INITIAL_NB="10.215.246.196"
OVN_INITIAL_SB="10.215.246.196"
OVN_NB_CONNECT="ssl:10.215.246.196:6641,ssl:10.215.246.251:6641,ssl:10.215.246.85:6641"
OVN_SB_CONNECT="ssl:10.215.246.196:6642,ssl:10.215.246.251:6642,ssl:10.215.246.85:6642"
OVN_LOCAL_IP="10.215.246.196"
```

```
snap run --shell microovn -c "ovn-nbctl --timeout=10 --db ssl:10.215.246.196:6641,ssl:10.215.246.251:6641,ssl:10.215.246.85:6641 -c /etc/ovn/cert_host -p /etc/ovn/key_host -C /etc/ovn/ovn-central.crt --wait=sb --format=csv --no-headings --data=bare --colum=_uuid,name,acl find port_group name=lxd_net2"

(2023-06-22T03:32:33Z|00001|stream_ssl|ERR|SSL_use_certificate_file: error:80000002:system library::No such file or directory
2023-06-22T03:32:33Z|00002|stream_ssl|ERR|SSL_use_PrivateKey_file: error:10080002:BIO routines::system lib
2023-06-22T03:32:33Z|00003|stream_ssl|ERR|Private key must be configured to use SSL
2023-06-22T03:32:33Z|00004|stream_ssl|ERR|Certificate must be configured to use SSL
2023-06-22T03:32:33Z|00005|stream_ssl|ERR|Private key must be configured to use SSL
2023-06-22T03:32:33Z|00006|stream_ssl|ERR|Certificate must be configured to use SSL
2023-06-22T03:32:33Z|00007|stream_ssl|ERR|Private key must be configured to use SSL
2023-06-22T03:32:33Z|00008|stream_ssl|ERR|Certificate must be configured to use SSL
ovn-nbctl: ssl:10.215.246.196:6641,ssl:10.215.246.251:6641,ssl:10.215.246.85:6641: database connection failed (Protocol not available))
```

Likely related is that the new certificates are only placed on the first three machines of the cluster, but additional machines don't receive these certs:
on the first 3 machines:
```
ls -l /var/snap/microovn/common/data/pki/
total 36
-rw-r--r-- 1 root root 749 Jun 22 03:32 cacert.pem
-rw-r--r-- 1 root root 745 Jun 22 03:32 ovn-controller-cert.pem
-rw-r--r-- 1 root root 288 Jun 22 03:32 ovn-controller-privkey.pem
-rw-r--r-- 1 root root 741 Jun 22 03:32 ovn-northd-cert.pem
-rw-r--r-- 1 root root 288 Jun 22 03:32 ovn-northd-privkey.pem
-rw-r--r-- 1 root root 733 Jun 22 03:32 ovnnb-cert.pem
-rw-r--r-- 1 root root 288 Jun 22 03:32 ovnnb-privkey.pem
-rw-r--r-- 1 root root 733 Jun 22 03:32 ovnsb-cert.pem
```

on machines that joined afterward:
```
ls -l /var/snap/microovn/common/data/pki/
total 12
-rw-r--r-- 1 root root 749 Jun 22 03:32 cacert.pem
-rw-r--r-- 1 root root 745 Jun 22 03:32 ovn-controller-cert.pem
-rw-r--r-- 1 root root 288 Jun 22 03:32 ovn-controller-privkey.pem
```

[Frode Nordahl (fnordahl)]

https://github.com/canonical/microovn/pull/37

[Martin Kalcok (martin-kalcok)]

Also related: https://github.com/lxc/lxd-pkg-snap/pull/124