Merge branch...

Merge branch '240-multiple-rrsigs-on-some-records-in-signed-zone-even-though-only-one-key-is-ever-active-at-a-time-v9_12-v9_11' into 'v9_11'

Resolve "Multiple RRSIGs on some records in signed zone even though only one key is ever active at a time"

Closes #240

See merge request !231
7 jobs for v9_11 in 5 minutes and 59 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Precheck
passed #16812
amd64 docker linux
precheck:debian:sid:amd64

00:00:11

 
  Build
passed #16813
amd64 docker linux
build:debian:sid:amd64

00:01:34

passed #16814
i386 docker linux
build:debian:sid:i386

00:01:40

 
  Test
passed #16817
amd64 docker linux
systemtest:debian:sid:amd64

00:04:04

passed #16818
i386 docker linux
systemtest:debian:sid:i386

00:04:07

passed #16815
amd64 docker linux
unittest:debian:sid:amd64

00:00:49

passed #16816
i386 docker linux
unittest:debian:sid:i386

00:00:43