Merge branch 'development' of ssh://git.nic.cz/knot into development

src/libknot/rrset-dump.h

src/libknot/zone/zone-contents.c

src/utils/common/exec.c

src/utils/common/exec.h

src/utils/dig/dig_exec.c

src/utils/dig/dig_params.c

src/utils/host/host_params.c

src/utils/nsupdate/nsupdate_exec.c

src/utils/nsupdate/nsupdate_params.c