- The canonical domain name was not taken from the CNAME RRSet in
  zone, but from the one synthetized from the wildcard. This caused
  the node's owner to be different than the CNAME name.
- Added the case causing the cycling in to the example.com zone.

fixes #1313 @1h30m

Conflicts:
	src/knot/server/tcp-handler.c

- Only zones from old db having the exact same pointer as the zone
  in new db will be removed from the old db prior to destruction of
  the old db. Others will remain there and be destroyed also.

fixes #1257 @1h30m

- Created separate function for creating error response from
  partially assembled response packet. This function will take only
  the portion of the wireformat appropriate to the size of
  the query (just the Header and Question section).
- Added packet_question_size() to get the size of Header + Question

fixes #1300 @1h

Reverted back to blocking sockets, using NB sockets caused recv() returning too early in tcp_recv().

refs #1289

refs #1289

- Should fix problem with not reading whole packet.

Todo: implement recv() timeout.

refs #1289

Todo: implement properly.

refs #1289

- If the last binary part was empty, the RDATA item was not created.
  This caused errors in transfer processing.

refs #1296 @1h30m

refs #1289

refs #1289

- Just a temporary hack for now - will send the partially
  assembled answer with a SERVFAIL error code.
- Should change it so that proper SERVFAIL response is sent.

refs #1300 @10m

- This must be handled as a NODATA case, not NXDOMAIN as in the
  case of NSEC.

fixes #1272 @5h

- However, it seems that nowhere it is required that the adjusting
  checks version. Maybe will be removed later. Now it was important
  to get that parameter to some lower-level functions which
  defaultly used version checking. This was causing problems when
  adjusting zone received by AXFR (nodes do not have the zone set).