Include retries MTA option

Access mapping table MTA options:  (bitmask)
New in MS 8.0.2.3. This option selectively enables the inclusion of message retry count information in various mapping table probes. When enabled, the number of previous retry attempts as well as a "skip count" will be included as a field in the probe, separated by a comma. A -1 will appear if the retry count or skip count, respectively, cannot be determined.

The skip count is an integer value encoded as part of the queue entry filename that is intended for use in keeping track of round-robin positioning in IP address lists.

FORWARD COMPATIBILITY NOTE: Additional comma-separated values may be added to this field in the future. Implementations should be aware of this and take appropriate steps to handle the field valye properly.

This option takes a bit-encoded integer value. The currently defined bits are shown in the following table: