Local openldap service doesn't have logs

[Andy]

Brief Description
-----------------
Local openldap service (slapd) doesn't have logs.

Severity
--------
Minor: System/Feature is usable with minor issue

Steps to Reproduce
------------------
On a live system, check /var/log.

Expected Behavior
------------------
There is log in /var/log/ directory for openldap service.

Actual Behavior
----------------
There isn't log in /var/log/ directory for openldap service.

Reproducibility
---------------
100% reproducible

System Configuration
--------------------
Any

Branch/Pull Time/Commit
-----------------------
STX master

Last Pass
---------
Never

Timestamp/Logs
--------------
N/A

Test Activity
-------------
Developer Testing

Workaround
----------
N/A

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/config-files/+/881583

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config-files/+/881583
Committed: https://opendev.org/starlingx/config-files/commit/a72bf7dbdf421a496aa1c33631572c430551811e
Submitter: "Zuul (22348)"
Branch: master

commit a72bf7dbdf421a496aa1c33631572c430551811e
Author: Andy Ning <email address hidden>
Date: Wed Apr 26 11:47:22 2023 -0400

    Enable logging for local openldap service

    Currently local openldap service (slapd) doesn't have logs at all.
    This change enables logging for the service.

    Test Plan:
    PASS: Verify the logs are generated in /var/log/slapd.log after
          system is successfully deployed.
    PASS: Verify that standard openldap operations are logged, such as
          adding users, searching for users.
    PASS: Verify log file is rotated when reaching the configured size.

    Closes-Bug: 2017796
    Signed-off-by: Andy Ning <email address hidden>
    Change-Id: I277f25e855a51da1865d7cf995b0e447fb1e53be