HDDS-14998. Use line.separator in option descriptions

[adoroszlai]

What changes were proposed in this pull request?

Use platform-specific line separator in CLI command/option descriptions instead of hard-coded \n.

https://picocli.info/#_format_specifiers

https://issues.apache.org/jira/browse/HDDS-14998

How was this patch tested?

Verified help is formatted OK (same as before) for few commands:

$ ozone sh volume create --help
...
      <value>              URI of the volume.
                           Ozone URI could either be a full URI or short URI.
                           Full URI should start with o3://, in case of non-HA
                           clusters it should be followed by the host name and
                           optionally the port number. In case of HA clusters
                           the service id should be used. Service id provides a
                           logical name for multiple hosts and it is defined
                           in the property ozone.om.service.ids.
                           Example of a full URI with host name and port number
                           for a key:
                           o3://omhostname:9862/vol1/bucket1/key1
                           With a service id for a volume:
                           o3://omserviceid/vol1/
                           Short URI should start from the volume.
                           Example of a short URI for a bucket:
                           vol1/bucket1
                           Any unspecified information will be identified from
                           the config files.
...

$ ozone sh bucket setacl --help
...
  -a, -al, --acl, --acls=<values>[,<values>...]
                        Comma separated ACL list:
                        Example: user:user2:a OR user:user1:rw,group:hadoop:a
                        r = READ, w = WRITE, c = CREATE, d = DELETE, l = LIST,
                          a = ALL, n = NONE, x = READ_ACL, y = WRITE_ACL.
...

$ ozone debug auditparser --help
...
Commands:
  load, l      Load ozone audit log files.

               To load an audit log to database:
               ozone debug auditparser <path to db file> load <logs>

  template, t  Execute template query.

               To run a template query on the audit logs loaded to the database:
               ozone debug auditparser <path to db file> template <template>

               Following templates are available:
               (Template)              (Description)
               top5users              : Top 5 users.
               top5cmds               : Top 5 commands.
               top5activetimebyseconds: Top 5 active times, grouped by seconds.

  query, q     Execute custom query.

               To run a custom read-only query on the audit logs loaded to the
                 database:
               ozone debug auditparser <path to db file> query <query>

https://github.com/adoroszlai/ozone/actions/runs/24202134040

[Russole]

Thanks @adoroszlai for working on this. LGTM!