PT-4110 Fix rate limiting plugin

[spetrashov]

What does this PR do?

This PR fixes the rate-limiting plugin in Janus. Now it will use X-Forwarded-For and X-Real-IP HTTP headers to fetch IP for rate-limiting.

[vgarvardt]

👍

[codecov[bot]]

Codecov Report

Merging #398 into master will not change coverage. The diff coverage is 50%.

@@           Coverage Diff           @@
##           master     #398   +/-   ##
=======================================
  Coverage   40.37%   40.37%           
=======================================
  Files          75       75           
  Lines        2635     2635           
=======================================
  Hits         1064     1064           
  Misses       1509     1509           
  Partials       62       62

Impacted Files	Coverage Δ
pkg/plugin/rate/rate_limit_logger.go	56% <0%> (ø)	:arrow_up:
pkg/plugin/rate/setup.go	51.92% <100%> (ø)	:arrow_up:

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[bghellofresh]

+1

[fftorres]

+1