The default `logrotate` configuration for _nginx_ may not be appropriate
for high-volume servers. The `nginx_keep_num_logs` variable is now
available to control how many days of logs are kept.
There are a few minor differences between the way Fedora and Buildroot
package *nginx*:
* Fedora uses a user named *nginx* while buildroot uses *www-data*
* Buildroot uses a Debian-like configuration layout (with
`sites-enabled` and `modules-enabled` directories)
This commit adjusts the *nginx* Ansible role to compensate for these
differences, eschewing Buildroot's configuration layout for the one used
by Fedora/Red Hat.
Dustin