Also code to gen-rdatacode.py to optionally use the new RdataFactory
for some types if configured to do so.

Also have a default implementation that simply concatenates
all token data into a string and calls the create() variant
which accepts a string.

It just contains MasterLoader::Options enum for now.

Cppcheck complained there's an uninitialized variable in constructor.
This is mostly a false positive (the value is not used before being
assigned), but fix it anyway to make it silent.

These make distcheck fail on a number of systems (they have built-in disabling code for a number of other systems). See ticket #2479

Conflicts:
	src/lib/datasrc/datasrc_messages.mes

Also adjust affected tests accordingly.

We never have a chain of the transitions. We only do start and zero or
one handle on the returned one. Simplify handle to return void, not
NULL.

Besides simplification, it allows testing without fake states (TBD) - we
had no real state to test the multiple transitions.

Conflicts (from cherry-pick):
	src/lib/dns/tests/master_lexer_unittest.cc

The copy is shallow anyway, so it wouldn't survive for long.

If there's an error that manifests at the end of a file, like an
unbalanced parenthesis or a quoted string that does not end, report the
error. But also, return EOF as the next token, not an exception.

It was deemed unneeded and is removed therefore, to make the code
smaller.

An include was missing.

So we can include less

So the issue callbacks don't depend on other things.

And few other similar renames.