add CHANGES and release notes

(cherry picked from commit 5f7a6232)
10 jobs for 173-option-to-disable-responding-with-cookies-isc-support-12614-master in 8 minutes and 32 seconds (queued for 1 second)
Status Job ID Name Coverage
  Precheck
passed #20089
amd64 docker linux
precheck:debian:sid:amd64

00:00:11

 
  Build
passed #20090
amd64 docker linux
build:clang:debian:sid:amd64

00:03:02

passed #20092
i386 docker linux
build:clang:debian:sid:i386

00:03:19

passed #20091
amd64 docker linux
build:debian:sid:amd64

00:02:00

passed #20093
i386 docker linux
build:debian:sid:i386

00:02:06

 
  Test
passed #20097
amd64 docker linux
systemtest:debian:sid:amd64

00:04:48

passed #20098
i386 docker linux
systemtest:debian:sid:i386

00:04:59

passed #20095
amd64 docker linux
unittest:clang:debian:sid:amd64

00:00:47

passed #20094
amd64 docker linux
unittest:debian:sid:amd64

00:00:47

passed #20096
i386 docker linux
unittest:debian:sid:i386

00:00:49