Init script (#529)
Init script (#529)

* Populate php-fpm.conf by default using php-fpm.conf.default

This allows users to just run `php-fpm` with minimal configuration
without removing the ability to configure php-fpm by editing the
conf file.

* Copy the php-fpm init script and systemd unit file to the prefix

The PHP build generates an init script and systemd unit for convenience.
Users may drop these in directly in their init.d or systemd directories
or use them as templates for customizing an init script or systemd unit.

This change just copies over the init script / unit file built by PHP

* Ensure the init script has execute permissions

* Add comments

php-build/php-build,gerardroche/php-build