FFe - Update dnspython to 1.9.3

[Scott Kitterman]

This is a mostly bugfix release with some minor feature additions. The only API changes are additions/extensions that won't affect existing code. The upstream changelog diff is:

2011-03-22 Bob Halley <email address hidden>

 * dns/resolver.py: a boolean parameter, 'raise_on_no_answer', has
   been added to the query() methods. In no-error, no-data
   situations, this parameter determines whether NoAnswer should be
   raised or not. If True, NoAnswer is raised. If False, then an
   Answer() object with a None rrset will be returned.

 * dns/resolver.py: Answer() objects now have a canonical_name field.

2011-01-11 Bob Halley <email address hidden>

 * Dnspython was erroneously doing case-insensitive comparisons
   of the names in NSEC and RRSIG RRs. Thanks to Casey Deccio for
   reporting this bug.

2010-12-17 Bob Halley <email address hidden>

 * dns/message.py (_WireReader._get_section): use "is" and not "=="
   when testing what section an RR is in. Thanks to James Raftery
   for reporting this bug.

2010-12-10 Bob Halley <email address hidden>

 * dns/resolver.py (Resolver.query): disallow metaqueries.

 * dns/rdata.py (Rdata.__hash__): Added a __hash__ method for rdata.

I've examined the upstream diff and this seems low risk. I'd like an FFe to get the bugfixes in Natty and to release with the most current version.

[Iulian Udrea (iulian)]

Approved.

[Scott Kitterman (kitterman)]

Uploaded.