Match FPM status pool's expose_php with parent

If an installed php.ini turns expose_php on/off, and an FPM pool
overrides that with php_flag[expose_php]=off/on, a status pool
created

Match FPM status pool's expose_php with parent

If an installed php.ini turns expose_php on/off, and an FPM pool
overrides that with php_flag[expose_php]=off/on, a status pool
created with pm.status_listen in a pool config will have its expose_php
reflect the php.ini value, and not the pool config's override.

This change looks for an override set in
php_flag/php_value/php_admin_flag/php_admin_value and carries that
through.

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