BIND 10 #2000: update libdns++ OPT RDATA so it can handle EDNS options

[BIND 10 Development]

#2000: update libdns++ OPT RDATA so it can handle EDNS options
-------------------------------------+-------------------------------------
            Reporter:  jinmei        |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  Unclassified  |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  NSID
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
-------------------------------------+-------------------------------------
 This is necessary for NSID support.

 This task itself is independent from NSID (in the OPT RDATA class
 we'll handle the options as opaque data).

 We'll need to
 - decide internal class representation for option data
 - update all methods except the "from text" constructor

 See also BIND 9's implementation at bind9/lib/dns/rdata/generic/opt_41.c

-- 
Ticket URL: <http://bind10.isc.org/ticket/2000>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development