Merge 'DNSSEC policy in configuration'

.ycm_extra_conf.py

Knot.files

Knot.includes

configure.ac

doc/configuration.rst

doc/man/keymgr.8in

doc/man/knot.conf.5in

doc/man_keymgr.rst

doc/migration.rst

doc/reference.rst

src/Makefile.am

src/contrib/files.c

src/contrib/files.h

src/dnssec/lib/dnssec/kasp.h

src/dnssec/lib/kasp/dir/dir.c

src/dnssec/lib/kasp/dir/zone.c

src/dnssec/lib/kasp/internal.h

src/dnssec/lib/kasp/policy.c

src/dnssec/lib/kasp/zone.c

src/dnssec/lib/kasp/zone.h