[OpenSIPS-Devel] [opensips] load_balancer module enhancements (#345)

[Sergey KHripchenko]

Ok, I got it. I just try to avoid alloc's at any cost.

There are also some problems i found: please look at my commit: https://github.com/shripchenko/opensips/commit/26de7268598c54c1581befe21204d592b5ce2f09

And one more commit to review:https://github.com/shripchenko/opensips/commit/41812d4512a5ab2d331fc390e93e700a2fb88b8d

In my work I face a situation when there was a big amount of calls with duration=0 (like rejected calls).
And since LB normally takes first matched destination with minimum load first/one node was overwhelmed with calls and other nodes are almost free.
(load was even for all nodes and equal to zero)
it is, of course, a corner situation and not widely reproducible, but still possible.
And I believe it adds a new level of 'fairness' to LB.
It is cheap also.

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