added variables and default values

defaults/main.yml

 ---
-php_module_config_file: "module.ini.j2"
-php_module_priority: <module prio> 
+php_module_config_file: "pcre.ini.j2"
+php_module_priority: 20
+php_mod_pcre_backtrack_limit: 1000000
+php_mod_pcre_recursion_limit: 100000
+php_mod_pcre_jit: true

vars/main.yml

 ---
-php_module_name: "<module name>"
+php_module_name: "pcre"