consts: merge rcodes with tsig rcodes and reformat

src/knot/server/xfr-handler.c

src/knot/server/zones.c

src/libknot/consts.h

src/libknot/nameserver/name-server.c

src/libknot/tsig-op.c

src/libknot/tsig.c

src/utils/common/exec.c