adding custom-logger and syslog-logger rules

Try it with this JSON script : 

(otherwise I also get a "No rules for diffs:add:/custom-handler.... could look at that)

```
{
    "logging" =>    {
        "async-handler" => {"ASYNC" => {
            "enabled" => true,
            "encoding" => undefined,
            "filter" => undefined,
            "filter-spec" => undefined,
            "formatter" => "%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n",
            "level" => "ALL",
            "name" => "ASYNC",
            "overflow-action" => "BLOCK",
            "queue-length" => 50,
            "subhandlers" => [
                "FILE-CUSTOM",
                "SYSLOG-CUSTOM"
            ]
        }},
        "custom-handler" => {"FILE-CUSTOM" => {
            "class" => "org.jboss.logmanager.handlers.PeriodicSizeRotatingFileHandler",
            "enabled" => true,
            "encoding" => undefined,
            "filter" => undefined,
            "filter-spec" => undefined,
            "formatter" => "%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%m%n",
            "level" => "ALL",
            "module" => "org.jboss.logmanager",
            "name" => "FILE-CUSTOM",
            "named-formatter" => undefined,
            "properties" => {
                "rotateSize" => "1024000",
                "maxBackupIndex" => "20",
                "suffix" => ".yyyy-MM-dd",
                "fileName" => expression "${jboss.server.log.dir}/server.log"
            }
        }},
        "pattern-formatter" => {
            "PATTERN" => {
                "color-map" => undefined,
                "pattern" => "%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"
            },
            "COLOR-PATTERN" => {
                "color-map" => undefined,
                "pattern" => "%K{level}%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"
            }
        },
        "root-logger" => {"ROOT" => {
            "filter" => undefined,
            "filter-spec" => undefined,
            "handlers" => ["ASYNC"],
            "level" => "INFO"
        }},
        "syslog-handler" => {"SYSLOG-CUSTOM" => {
            "app-name" => undefined,
            "enabled" => true,
            "facility" => "local-use-2",
            "hostname" => "$jboss.qualified.host.name-$jboss.node.name",
            "level" => "INFO",
            "port" => 514,
            "server-address" => "localhost",
            "syslog-format" => "RFC5424"
        }}
    }
}
```