Fixed compilation warning in debug.c

- Added wrapper function for knot_node_dump()
Fixed compilation warning in tsig.c.

- Added proper variable type to print function.
manual page for knsupdate

refs #2380

Change-Id: I940a3193f39568ed3868bbe730d131edacb56620
knsupdate: fix TSIG algorithm specification on command line

Bug: #2396
Change-Id: Id45a84bb606872361162703e91b2ff24d9ede7e8
nsupdate: disallow key specification multiple times

norefs
Fixed wrong compare function used in ddns.c.

Whole RDATA compare is not needed, equality is enough.
Added missing #ifdef
Removed obsolete rrset_compare functions.

- They were not properly implemented anyway and are not needed in the server.
- Removed tests as well.

Change-Id: Id2794fc7b29b9bf03491bbc4c168be796372bfe3
nsupdate: change default timeout from 300 seconds to 12 seconds

more reasonable value, ISC nsupdate uses the same
nsupdate: allow overriding of the key from update file
configure: reduce obsolete and redundant header checks
utils: move TSIG functions to the utils/common

refs #2137

Change-Id: I327a9431ab402ffbe6fac3230a678aa34b7add80
tsig: fix two compile warnings
Incoming NOTIFY logs SOA and qname.

refs #2398
consts: merge rcodes with tsig rcodes and reformat

Change-Id: I0a751268fb674e65ca5ccd141c037a9fab67f096
Added missing frees to zone-load.c.

- Coverity: 1001979

Change-Id: I17b11a84c8ba9fad9d6d324ca8d19574a5aa4e14
Added function to print timeval difference.
Added function for fetching zone serial.
Update xfers log format.

* NOTIFY message includes serial.
* Transfer start message includes serial(s).
* Transfer end message includes elapsed times.
* Each processed xfer delta is logged.

Examples:
Incoming IXFR of 'example.com.' with '<ip>' key 'abcd.': Started (serial 43).
Incoming IXFR of 'example.com.' with '<ip>' key 'abcd.': serial 43 -> 44.
Incoming IXFR of 'example.com.' with '<ip>' key 'abcd.': Finished in 0.10s (finalization 0.00s).
NOTIFY of 'example.com.' to '<ip>': Query issued (serial 44).
Outgoing AXFR of 'example.com.' to '<ip>' key 'abcd.': Started (serial 44).
Outgoing AXFR of 'example.com.' to '<ip>' key 'abcd.': Finished in 0.75s.

refs #2398

Change-Id: Ic4d0ca486dc3cf2c4616b77f359c037d53165f1d
Cleaned up whitespace and error code name.

fixes for gerrit:994