Simple traffic load balancing among peers

[nsowen]

Issue #36: Implemented simple balancing mechanisms based upon the weighted round-robin and weighted least-connections strategies. Weighted least-connections is based on the statistics module and utilizes AppGenRequestPerSecond+NetGenRequestPerSecond. It would be worth actually counting the pending requests in a separate statistic record.

[deruelle]

Thanks @nsowen !

@brainslog can you review ?

[brainslog]

Thanks for this contribution @nsowen! Great level of detail in documentation and test coverage, awesome work!

Just a minor tip regarding slf4j, it doesn't require checking if the log level is enabled, since it is cheaper to simply call the logger.<level>(...) method (provided that the params, in case they exist, aren't performing heavy operations).

There are some code-style rules that we will be implementing soon, which will impact these files (2 space indentation, requiring braces where optional, etc.) but we'll fix those when committing the rules.

Thanks, merging.

[deruelle]

Thanks for the contribution @nsowen ! Acknowledged at https://telestax.com/acknowledgements/