2.4.1

• Deprecate Makefile target logs-delayed; replaced with logsdef.
• Updates Varnish to 6.2.1.
• Updates gcc package to 4.8.5-39.
• Updates startsecs for varnishncsa-wrapper to 5 seconds.
• Updates test/health_status helper script with for consistency.
• Updates Makefile target logs to accept [OPTIONS] (e.g make -- logs -ft).
• Updates info/error output for consistency.
• Updates healthcheck failure messages to remove EOL character that is rendered in status response.
• Updates ordering of Tags and respective Dockerfile links in README.md for readability.
• Adds improved test workflow; added test-setup target to Makefile.
• Adds Makefile target logsdef to handle deferred logs output within a target chain.
• Adds /docs directory for supplementary documentation and simplify README.
• Fixes validation failure of 0 second --timeout value in test/health_status.