Merge branch 'new_iohandler' into development

doc/reference.texi

samples/knot.full.conf

src/common/acl.c

src/common/sockaddr.c

src/common/sockaddr.h

src/knot/common.h

src/knot/conf/cf-lex.l

src/knot/conf/cf-parse.y

src/knot/conf/conf.c

src/knot/conf/conf.h

src/knot/ctl/remote.c

src/knot/server/notify.c

src/knot/server/notify.h

src/knot/server/rrl.c

src/knot/server/server.c

src/knot/server/server.h

src/knot/server/tcp-handler.c

src/knot/server/udp-handler.c

src/knot/server/xfr-handler.c

src/knot/server/xfr-handler.h