php ini configuration changes

* set ldap.max_links to 5 from unlimited (-1)
* increase some opcache defaults, disable timestamp check

src/php/php.ini

@@ -491,8 +491,14 @@ zend.assertions = -1
 
 [ldap]
 ; Sets the maximum number of open links or -1 for unlimited.
-ldap.max_links = -1
+ldap.max_links = 5
 
 [opcache]
 ; Determines if Zend OPCache is enabled
 opcache.enable=1
+; default: 128 maximum memory that OPcache can use to store compiled PHP files
+opcache.memory_consumption=256
+; default: 10000 maximum number of files that can be stored in the cache
+opcache.max_accelerated_files=20000
+; don't check timestamps, in prod php files are never modified
+opcache.validate_timestamps=0