LBFactory_Wikia: introduce normalizeMultipleMasters()
Add unit test for LBFactory_Wikia::normalizeMultipleMasters
LBFactory_Multi: run stylize.php
Mark broken master node
Check if master is not marked as broken
MastersPoll: return DB server settings array that can be used by LoadBalancer
MastersPoll: use threshold before marking a host as broken
MastersPoll: add comments and logging
Merge pull request #4629 from Wikia/lb-multiple-masters

I shall choose friends among men, but neither slaves nor masters.