Introduce php_version_main and make php_version always format x.y

tasks/configure.yml

@@ -21,7 +21,7 @@
     content: "export PATH=${PATH}:{{ composer_home_path }}/vendor/bin\n"
 
 - name: "Disable XDebug for CLI"
-  command: '{{ (php_version|default("5.5") == "7") | ternary("phpdismod", "php5dismod") }} -s cli xdebug'
+  command: '{{ (php_version_main|default("7") == "7") | ternary("phpdismod", "php5dismod") }} -s cli xdebug'
   tags: 'update'
 
 - name: "Global Config Composer"