Disable opcache.use_cwd

All scripts are executed in single working directory, so it should not
cause any harm and according to documentation it should perform better.

Issue #98

Signed-off-by: Michal Čihař <michal@cihar.com>

Author: nijel

etc/php.ini

@@ -1786,7 +1786,7 @@ opcache.enable=1
 ; directory to the script key, thus eliminating possible collisions between
 ; files with the same name (basename). Disabling the directive improves
 ; performance, but may break existing applications.
-;opcache.use_cwd=1
+opcache.use_cwd=0
 
 ; When disabled, you must reset the OPcache manually or restart the
 ; webserver for changes to the filesystem to take effect.