Session gc_maxlifetime and cookie_lifetime with php-fpm pool config

[weierophinney]

Continuing the bug report from zendframework/zendframework#4733

TL:DR;

When the following settings are set via the pool config from php-fpm and not in php.ini, they cannot be overwritten via php's ini_set():

• session.gc_maxlifetime
• session.cookie_lifetime

ZF2 tries to reset them anyway and fails (see old bug report for details).
ZF2 Versions tested: 2.2.1, 2.4.1, 2.5.3
On PHP 5.6

example php-fpm pool conf line:
php_admin_value[session.gc_maxlifetime] = 1880

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Originally posted by @maces at zendframework/zend-session#53