Beaker: Acceptance Tests

This adds rake `spec:acceptance` testing very basic installation on CentOS, Ubuntu, Debian and SLES.

As side effect this adds `php::settings` which is a pass-through parameter for `php::fpm::settings` and `php::cli::settings`.

Fixes contained:
 * include apt in ubuntu/debian repos
 * fix sles/centos fpm users
 * fix centos fpm ini path