module version 4 breaks extension configurations

[vchepkov]

php::extensions resource type in version 4 breaks configuration of several extensions. IMHO, option should be added 'manage_config' with default false, to preserve compatibility with previous version

here is example, on RHEL7

rpm -qc php-pecl-memcached-2.2.0-1.el7.x86_64 /etc/php.d/z-memcached.ini

Granted, name of the config is silly, but there is no way to currently change it in the module

php-pecl-zendopcache-7.0.5-2.el7.x86_64

zend_extension=/usr/lib64/php/modules/opcache.so

that's doesn't match what module set, causing fpm to fail and there is no way to provide path to the .so either