upgrade: using ynh_replace_string and php 7

scripts/upgrade

@@ -31,14 +31,14 @@ service_checker_name=$service_name"-checker"
 
 # Apply renaming that occured in v1.2.0 ("vpnadmin" -> "${app}")
 if [ -f /etc/nginx/conf.d/${domain}.d/vpnadmin.conf ]; then
-  sed "s|/var/www/vpnadmin/|/var/www/${app}/|g" -i "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
-  sed "s|vpnadmin.sock|${app}.sock|g" -i "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
+  ynh_replace_string "/var/www/vpnadmin/" "/var/www/${app}/" "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
+  ynh_replace_string "vpnadmin.sock" "${app}.sock" "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
   mv /etc/nginx/conf.d/${domain}.d/vpnadmin.conf /etc/nginx/conf.d/${domain}.d/${app}.conf
 fi
 if [ -f /etc/php5/fpm/pool.d/vpnadmin.conf ]; then
-  sed "s|/var/www/vpnadmin/|/var/www/${app}/|g" -i /etc/php5/fpm/pool.d/vpnadmin.conf
-  sed "s|vpnadmin.sock|${app}.sock|g" -i  /etc/php5/fpm/pool.d/vpnadmin.conf
-  mv /etc/php5/fpm/pool.d/vpnadmin.conf /etc/php5/fpm/pool.d/${app}.conf
+  ynh_replace_string "/var/www/vpnadmin/" "/var/www/${app}/" /etc/php/7.0/fpm/pool.d/vpnadmin.conf
+  ynh_replace_string "vpnadmin.sock" "${app}.sock"  /etc/php/7.0/fpm/pool.d/vpnadmin.conf
+  mv /etc/php5/fpm/pool.d/vpnadmin.conf /etc/php/7.0/fpm/pool.d/${app}.conf
 fi
 test -d /var/www/vpnadmin && mv /var/www/vpnadmin /var/www/${app}