Use existing SSL certs in LDAP tests instead of generating them
The SSL test suite has a bunch of pre-existing certificates, so it's
better simply to use what we already have than generate new certificates
each time the LDAP tests are run.
Discussion: https://postgr.es/m/
bc305c7a-f390-44f2-2e82-
9bcaec6108da@dunslane.net