During Apache initialization, fix PHP5 extensions

php-luasandbox hasn't been updated for Trusty properly, so it still plops its
configuration file in /etc/php5/conf.d. As a workaround, have Apache migrate
any config file in that directory to match the new directory layout for Trusty.

Change-Id: I6833d719a272dd892f914ca18465111154a0e132
Merge "During Apache initialization, fix PHP5 extensions"