Add on_worker_fork
hook, which allows to mimic Unicorn's behavior
#664
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http://bogomips.org/unicorn.git/tree/lib/unicorn/configurator.rb#n154
http://unicorn.bogomips.org/Unicorn/Configurator.html#method-i-before_fork
After reading both unicorn and puma cluster implementations,
I think this hook is required when
preload_app
is used to dropActiveRecord connections, established in master process.