[WIP] Fix #714 - Switch to (mainly) sslyze for TLS testing #1316

Job	Run time
build-docker (internet.nl, docker/Dockerfile, app)	6m 49s
build-docker (unbound, docker/Dockerfile, unbound)	29s
build-docker (linttest, docker/Dockerfile, linttest)	7m 10s
build-docker (test-runner, docker/test-runner.Dockerfile)	41s
build-docker (webserver, docker/webserver.Dockerfile)	27s
build-docker (grafana, docker/grafana.Dockerfile)	31s
build-docker (cron, docker/cron.Dockerfile)	31s
integration-test	3m 7s
docs	1s
lint/check	43s
development-environment-test	2m 29s
test	2m 12s
batch-integration-test	2m 34s
	27m 44s

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