File knot.conf.5.in is generated from the documentation.

image)

Previous logic was too complicated and confusing. Currently, there are
just two pregenerated source files which are selected on the basis of
the --disable-fastparser configure option.

Pregenerated files can be updated using scripts/update-parser.sh script.

Coccinelle patch performing most changes included.

(changes in scanner intentionally skipped)

Coccinelle patch used to perform this cleanup is included.

Change-Id: Ia367764245c845839fd22034b2b5f58b93bd54e8