main/rrdtool: drop py-rrd that is python2 only

7 jobs for !698 with rrdtool in 2 minutes and 2 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #7324
docker-alpine x86_64
lint

00:00:16

 
  Build
passed #7329
docker-alpine ci-build aarch64
build-aarch64

00:01:22

passed #7330
docker-alpine ci-build armv7
build-armv7

00:01:34

passed #7328
docker-alpine ci-build ppc64le
build-ppc64le

00:01:45

passed #7327
docker-alpine ci-build s390x
build-s390x

00:01:19

passed #7326
docker-alpine ci-build x86
build-x86

00:01:21

passed #7325
docker-alpine ci-build x86_64
build-x86_64

00:01:26