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It is now a thin wrapper around the ZoneDataUpdater.

The ZoneDataLoader can still be simplified to remove the vectors
in it (as the RdataSet now merges for us). This will be done
in a future commit.

* In some tests, the RdataSet list sequence changed (as there's no
  order enforced for this data). Tests were adjusted for it.
* Some test data was adjusted to add missing NS records.
* Some tests now pass and don't throw exceptions as duplicate
  records for a type are now accepted.

the behavior was changed slightly: on second thought it seemed to make
more sense to adopt the smallest TTL.  An existing test case was removed
because it's now covered in more comprehensive tests for this change.

with lot of duplicate code right now, and some corner cases are not yet
handled.

all basic cases are covered and tested.  still some code duplicate.
ignoring corner cases.

This is necessary to extend RdataSet class so it calculates the correct
number of RDTA/RRSIGs excluding duplicates.

some test cases are hardcoded, not all cases are covered yet.

also, as a cleanup, removed an unused class member variable.

Conflicts:
	ChangeLog

Conflicts:
	ChangeLog

Conflicts:
	src/lib/python/isc/ddns/session.py

ignoring the result fixes a scan-build error.  besides, ignore() should be
more appropriate choice for what it intends to do anyway.