daemonization by setting UNICORN_DAEMONIZE env

Daemonization only happens once at initial startup and is less
intrusive than traditional daemonize routines:  we do not chdir,
set umask, or redirect/close STDOUT/STDERR since those are
doable via other config options with Unicorn (and the Unicorn
"config file" is just Ruby).

STDIN has no business being open on a daemon (and can be
dangerous to close if using certain buggy third-party libs).

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