GitLab

also constify one variable.

also constify one other object.

Also removed OldRdataFactory/new_rdata_factory_users stuff, since all Rdata classes now use the new RdataFactory.

Conflicts:
	src/lib/dns/gen-rdatacode.py.in

- use the unnamed namespace for the entire content to hide as many things as
  possible.
- define rdata_tsig inside the fixture class to avoid initialization fiasco.
  (to make it possible, also make toWireCommonChecks a member function).

- use the unnamed namespace for the entire content to hide as many things as
  possible.
- define rdata_tsig inside the fixture class to avoid initialization fiasco.
  (to make it possible, also make toWireCommonChecks a member function).

Conflicts:
	src/lib/dhcp/tests/pkt6_unittest.cc