mod_passenger provides a passenger.conf containing PassengerRoot to
ensure the service starts up correctly.  On EL7, this is installed at
/etc/httpd/conf.d/passenger.conf and has been protected from purging
since 005bf61.

The change in 2a60859 to move LoadModule config files to
/etc/httpd/conf.modules.d/ on EL7 also affected the path of the
protected passenger.conf.  This change reverts the path change to match
the packages.

In summary, prior to 2a60859 (release 1.7.0):

- /etc/httpd/conf.d/passenger.conf with PassengerRoot (packaged)
- /etc/httpd/conf.d/passenger_extra.conf with apache::mod::passenger settings
- /etc/httpd/conf.d/zpassenger.load with LoadModule

In 2a60859 (release 1.8.0):

- /etc/httpd/conf.modules.d/passenger_extra.conf with apache::mod::passenger settings
- /etc/httpd/conf.modules.d/zpassenger.load with LoadModule
- /etc/httpd/conf.d/passenger.conf is purged

With this commit:

- /etc/httpd/conf.modules.d/passenger_extra.conf with apache::mod::passenger settings
- /etc/httpd/conf.modules.d/zpassenger.load with LoadModule
- /etc/httpd/conf.d/passenger.conf with PassengerRoot (packaged)

Preserve /etc/httpd/conf.d/passenger.conf on EL7

(MODULES-3018) Fixes apache to work correctly with concat.

-   Adds more default values for parameters.
-   Styles parameters and values more consistently.
-   Updates several broken or outdated external links.
-   Fixes broken internal links.
-   Replaces "define" (as a noun) with "defined type" for clarity.
-   Updates code fences from tildes to backticks.
-   Fixes mispelled references to `mod_auth_mellon`.

1.8.x README revisions

Release Prep for 1.8.1