Re: client auth with lets encrypt certs

[rob thijssen]

update:

regular client auth fixed by correcting the expected syntax (needs backslashes) in user creation:
```sql
... REQUIRE SUBJECT '/CN=abc.example.com' AND ISSUER '/C=US/O=Let\'s Encrypt/CN=R3';
```

now just need to get replication working with ssl auth. currently seeing
- '[MY-010914] [Server] Bad handshake' in source error log
- 'SSL connection error: Failed to set ciphers to use, Error_code: MY-002026' in replica error log