A %Monitor data type class representing a boolean Integer Flag. Corresponds to the SNMP Integer32 data type.
A Flag expressed as an Integer which may only be 1 (True) or 0 (False).
Used for enumerated (multiple-choice) attributes.
VALUELIST is either a null string ("") or a delimiter
separated list (where the delimiter is the first character) of logical values.
If a non-null value is present, then the attribute is restricted to values
in the list, and the validation code simply checks to see if the value is in the list.