add CHANGES and release notes documentation

(cherry picked from commit f924c89f)
14 jobs for 511-add-ms-selfsub-and-krb5-selfsub-v9_12 in 9 minutes and 20 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Precheck
passed precheck:debian:sid:amd64 #56012
amd64 docker linux

00:00:16

 
  Build
passed build:centos:centos6:amd64 #56013
amd64 docker linux

00:02:33

passed build:centos:centos7:amd64 #56014
amd64 docker linux

00:02:42

passed build:debian:sid:amd64 #56015
amd64 docker linux

00:03:03

passed build:debian:sid:i386 #56016
i386 docker linux

00:04:15

 
  Test
passed install:debian:sid:amd64 #56025
amd64 docker linux

00:02:32

passed systemtest:centos:centos6:amd64 #56021
amd64 docker linux

00:04:43

passed systemtest:centos:centos7:amd64 #56022
amd64 docker linux

00:04:46

passed systemtest:debian:sid:amd64 #56023
amd64 docker linux

00:04:44

passed systemtest:debian:sid:i386 #56024
i386 docker linux

00:04:36

passed unittest:centos:centos6:amd64 #56017
amd64 docker linux

00:00:54

passed unittest:centos:centos7:amd64 #56018
amd64 docker linux

00:00:53

passed unittest:debian:sid:amd64 #56019
amd64 docker linux

00:00:51

passed unittest:debian:sid:i386 #56020
i386 docker linux

00:00:53