[WIP] Fix #714 - Switch to (mainly) sslyze for TLS testing #1471

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	5m 7s
build-docker (unbound, docker/Dockerfile, unbound)	32s
build-docker (linttest, docker/Dockerfile, linttest)	5m 47s
build-docker (test-runner, docker/test-runner.Dockerfile)	27s
build-docker (webserver, docker/webserver.Dockerfile)	33s
build-docker (grafana, docker/grafana.Dockerfile)	1m 2s
build-docker (cron, docker/cron.Dockerfile)	43s
lint/check	45s
development-environment-test	2m 27s
docs	1s
integration-test	2m 57s
test	2m 25s
batch-integration-test	2m 28s
	25m 14s

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