Add replica_transport support for LDAPS and StartTLS

[cruelsmith]

SSL and TLS has been replaced with LDAPS and StartTLS on some newer dsconf utils.

# man dsconf
[...]
COMMAND 'dsconf repl-agmt create'
       usage: dsconf instance repl-agmt create [-h] --suffix SUFFIX --host HOST
                                               --port PORT --conn-protocol
                                               CONN_PROTOCOL [--bind-dn BIND_DN]
                                               [--bind-passwd BIND_PASSWD]
                                               --bind-method BIND_METHOD
                                               [--frac-list FRAC_LIST]
                                               [--frac-list-total FRAC_LIST_TOTAL]
                                               [--strip-list STRIP_LIST]
                                               [--schedule SCHEDULE]
                                               [--conn-timeout CONN_TIMEOUT]
                                               [--protocol-timeout PROTOCOL_TIMEOUT]
                                               [--wait-async-results WAIT_ASYNC_RESULTS]
                                               [--busy-wait-time BUSY_WAIT_TIME]
                                               [--session-pause-time SESSION_PAUSE_TIME]
                                               [--flow-control-window FLOW_CONTROL_WINDOW]
                                               [--flow-control-pause FLOW_CONTROL_PAUSE]
                                               [--bootstrap-bind-dn BOOTSTRAP_BIND_DN]
                                               [--bootstrap-bind-passwd BOOTSTRAP_BIND_PASSWD]
                                               [--bootstrap-conn-protocol BOOTSTRAP_CONN_PROTOCOL]
                                               [--bootstrap-bind-method BOOTSTRAP_BIND_METHOD]
                                               [--init]
                                               AGMT_NAME

       AGMT_NAME
              The name of the replication agreement

OPTIONS 'dsconf repl-agmt create'
       --suffix SUFFIX
              Sets the DN of the replication suffix

       --host HOST
              Sets the hostname of the remote replica

       --port PORT
              Sets the port number of the remote replica

       --conn-protocol CONN_PROTOCOL
              Sets the replication connection protocol: LDAP, LDAPS, or StartTLS

[...]

See also https://manpages.ubuntu.com/manpages/focal/en/man8/dsconf.8.html#options%20'dsconf%20repl-agmt%20create' or https://man.archlinux.org/man/extra/389-ds-base/dsconf.8.en#conn~10

[fraenki]

Thanks for submitting this PR! And sorry that it took so long to review.

I would really like to know which 389-ds release introduced this change, but I can't find an answer. It looks like this was introduced back in 1.4.0 or 1.4.0.17, but documentation for these old releases is sparse. Given that 2.4.3 is the current version, let's just move on...

[fraenki]

I've opened issue #8 to investigate if there is more breakage in new (major) releases of 389-ds.