Description:
------------
When FPM is launched, if there is an error which prevents FPM from starting, 
nothing is written to stderr. Everyhting is logged to error_log only. 

Test script:
---------------
set a non sense value in php-fpm.conf:
listen=/tmp/php-fpm.sock
listen.user = nobody
listen.group = johndoe


Expected result:
----------------
root@wild:/LIBRE/dev/php-src/trunk# ./sapi/fpm/php-fpm

root@wild:/LIBRE/dev/php-src/trunk# ps aux | grep php-fpm
root      5473  0.0  0.0   2420   816 pts/3    S+   23:29   0:00 grep php-fpm

root@wild:/LIBRE/dev/php-src/trunk# tail -n 1 /tmp/php-fpm/php-fpm.log
Aug 24 23:29:35.774255 [ERROR] pid 5471, fpm_unix_resolve_socket_premissions(), 
line 61: [pool www_chroot] cannot get gid for group 'johndoe': Success (0)


Actual result:
--------------
root@wild:/LIBRE/dev/php-src/trunk# ./sapi/fpm/php-fpm

root@wild:/LIBRE/dev/php-src/trunk# ps ax | grep php-fpm
 5579 ?        Ss     0:00 ./sapi/fpm/php-fpm -p /tmp/php-fpm
 5580 ?        S      0:00 ./sapi/fpm/php-fpm -p /tmp/php-fpm
 5581 ?        S      0:00 ./sapi/fpm/php-fpm -p /tmp/php-fpm
 5582 ?        S      0:00 ./sapi/fpm/php-fpm -p /tmp/php-fpm

root@wild:/LIBRE/dev/php-src/trunk# tail -n 1 /tmp/php-fpm/php-fpm.log
Aug 24 23:31:54.094551 [NOTICE] pid 5579, fpm_event_loop(), line 111: ready to 
handle connections