This creates a new class to represent a TSIG key, containing name,
secret, and algorithm.

The keyring format is changed to be {name : key}, and the methods in
dns.tsigkeyring are updated to deal with old and new formats.

The Message class is updated to use dns.tsig.Key, although (to avoid
breaking existing code), it stores them in the keyring field.

Message.use_tsig() can accept either explicit keys, or keyrings; it will
extract and/or create a key.

dns.message.from_wire() can accept either a key or a keyring in the
keyring parameter.  If passed a key, it will now raise if the TSIG
record in the message was signed with a different key.  If passed a
keyring containing keys (as opposed to bare secrets), it will check that
the TSIG record's algorithm matches that of the key.

errno doesn't cause the errno field in the exception to be set, and thus
our exceptions were different and less useful than the stock ones.

Adjust gethostbyaddr() to filter addresses like the system one does.

stub resolvers.

Reduce default lifetime from 30 seconds to 5 seconds.

Testing more stuff.

Ignoring coverage of Windows as we have no way to integrate coverage data
from windows test runs at this time.

Ignoring other not important things.

mix.

This also fixes the UnboundLocalError from [Issue #509].