Merge remote-tracking branch 'origin/ctl_conf_optimization'

src/knot/conf/base.c

src/knot/conf/base.h

src/knot/conf/confio.c

src/knot/conf/confio.h

src/knot/conf/scheme.c

src/knot/ctl/commands.c

src/knot/server/server.c

src/knot/server/server.h

src/knot/zone/zone.h

src/knot/zone/zonedb-load.c

src/libknot/yparser/ypscheme.h

src/utils/keymgr/options.c

src/utils/knotc/interactive.c

src/utils/knotc/process.c

src/utils/knotd/main.c

tests/confio.c

tests/test_conf.h