Conflicts:
	src/knot/dnssec/zone-sign.c
	src/knot/updates/ddns.c
	src/knot/updates/xfr-in.c
	src/knot/zone/node.c
	src/knot/zone/node.h
	src/knot/zone/semantic-check.c
	src/knot/zone/zone-contents.c
	src/knot/zone/zone-contents.h
	src/knot/zone/zone-create.c
	src/libknot/rrset.c
	tests-extra/tests/ddns/basic/test.py

Note: ddns/basic fails now, but I don't think it's caused by my merge
jutsu.

- ns_put_rr function now accepts consts rrsets only
- fixed wrong TTL set in SOA copy
- removed a function move_rrset, to be replaced with RRSet function
  later.

Ddns When Zone Is Reloaded

See the commit message.

- all serialize/deserialize functions should be moved here eventually.

Update .travis.yml to not depend on build-dep command since Travis CI servers don't know knot package (yet)

- server_reconfigure before 'log_update_privileges', note added
- no introductory 'parsing configuration...' line
- logging starts right after the config is parsed, note added

`interface ADDRESS IPA6 '@' NUM` had AF_INET family