value-pairs: the key option of value-pairs is expanded to macros

Formerly it was expaned only to nvtable entries, but from now it
expands to macros as well without setting the scope.

Signed-off-by: Daniel Gados <gdani@balabit.hu>
format-json: fixing that the SEQNUM macro does not expand

Signed-off-by: Daniel Gados <gdani@balabit.hu>