- log client's address (needed to update _guess_remote also)
- log xfr type (currently it's always 'AXFR', but we'll soon support IXFR)
- log the event of quote failure

data.  also added some more test cases for _get_notify_slaves_from_ns
and some log messages.

XfroutSession().  The original code was already buggy in this sense, but
with the newer data source API it will be a bit more likely to happen
due to the generality of the API, so it would make sense to fix it here.

one question.

can happen from a broken data source)

instead of the old API.  Now we can completely drop
_create_rrset_from_db_record, so did it.  With this change the main xfrout
code is free from the old API.

not in _reply_xfrout_query() using the old API.
_create_rrset_from_db_record() is now almost obsolete, so the test for it
was also removed.

use that for logging.  get_query_zone_name/class() are now removed
(they were almost one-liner, and didn't see make much sense to be separate
methods other than making the code rather unredable)

using the new API.  _zone_has_soa() and _zone_exit() were not needed anymore,
so were removed, so were corresponding tests.

in _check_xfrout_available().

And revert the change from jreed-doxygen to io_asio_socket.h.
Opened a ticket for that #1366.

on a MockAccessor object.  Also added check code to detect any such attempt.

This included fixing conflict which introduced a new fix changing
bogus \parameter to \param.