remove unicorn config since we use puma now

config/unicorn.rb.example

-# uncomment and customize to run in non-root path
-# note that config/gitlab.yml web path should also be changed
-# ENV['RAILS_RELATIVE_URL_ROOT'] = "/gitlab"
-
-app_dir = File.expand_path '../../', __FILE__
-worker_processes 2
-working_directory app_dir
-
-# Load app into the master before forking workers for super-fast
-# worker spawn times
-preload_app true
-
-# nuke workers after 30 seconds (60 is the default)
-timeout 30
-
-# listen on a Unix domain socket and/or a TCP port,
-
-#listen 8080 # listen to port 8080 on all TCP interfaces
-#listen "127.0.0.1:8080"  # listen to port 8080 on the loopback interface
-listen "#{app_dir}/tmp/sockets/gitlab.socket"
-
-pid "#{app_dir}/tmp/pids/unicorn.pid"
-stderr_path "#{app_dir}/log/unicorn.stderr.log"
-stdout_path "#{app_dir}/log/unicorn.stdout.log"
-
-# http://www.rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
-if GC.respond_to?(:copy_on_write_friendly=)
-  GC.copy_on_write_friendly = true
-end
-
-
-before_fork do |server, worker|
-  # the following is highly recommended for Rails + "preload_app true"
-  # as there's no need for the master process to hold a connection
-  defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
-
-  ##
-  # When sent a USR2, Unicorn will suffix its pidfile with .oldbin and
-  # immediately start loading up a new version of itself (loaded with a new
-  # version of our app). When this new Unicorn is completely loaded
-  # it will begin spawning workers. The first worker spawned will check to
-  # see if an .oldbin pidfile exists. If so, this means we've just booted up
-  # a new Unicorn and need to tell the old one that it can now die. To do so
-  # we send it a QUIT.
-  #
-  # Using this method we get 0 downtime deploys.
-
-  old_pid = "#{server.config[:pid]}.oldbin"
-
-  if File.exists?(old_pid) && server.pid != old_pid
-    begin
-      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
-      Process.kill(sig, File.read(old_pid).to_i)
-    rescue Errno::ENOENT, Errno::ESRCH
-      # someone else did our job for us
-    end
-  end
-end
-
-after_fork do |server, worker|
-  # Unicorn master loads the app then forks off workers - because of the way
-  # Unix forking works, we need to make sure we aren't using any of the parent's
-  # sockets, e.g. db connection
-
-  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
-  # Redis and Memcached would go here but their connections are established
-  # on demand, so the master never opens a socket
-end