Log # of schedulers and if kernel poll is enabled on start
Log warnings if kernel poll is disabled or VM is running with just 1 scheduler
Add async-threads to the info banner
Add SMP support to the info banner
Log a warning if running with < 8 async threads
Remove single scheduler warning

It's not entirely clear what the heuristics should be.
Don't log SMP support, async threads, etc
Formatting
Add RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS to VM arguments
Make sure RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS has effect on Windows
Cosmetics
Warn if Nagle's algorithm is enabled by default
Accept SERVER_ADDITIONAL_ERL_ARGS from rabbitmq-env.conf
error_logger:warning_msg itself returns ok
Use proplists:get_value/3 here
Cosmetic: these can all be rolled together, and be a bit terser.
Format as number, don't explicitly convert to string then format as string.
Merge bug25848.