Relax the restart request limits

[bgrozev]

• Make restart request rate limits configurable.
• Relax restart request rate limits.

[codecov]

Codecov Report

Merging #1106 (81952f8) into master (e05f8da) will increase coverage by 0.12%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1106      +/-   ##
============================================
+ Coverage     27.58%   27.70%   +0.12%     
  Complexity      493      493              
============================================
  Files           129      129              
  Lines          7728     7741      +13     
  Branches       1087     1087              
============================================
+ Hits           2132     2145      +13     
  Misses         5323     5323              
  Partials        273      273              

Files Changed	Coverage Δ
...c/main/kotlin/org/jitsi/jicofo/ConferenceConfig.kt	95.58% <100.00%> (+0.67%)	⬆️
.../kotlin/org/jitsi/jicofo/conference/Participant.kt	52.76% <100.00%> (+0.81%)	⬆️

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