revert apache::mod::passenger default parameters for RedHat

My [prior PR](https://github.com/puppetlabs/puppetlabs-apache/pull/687) modified the default parameters for mod::passenger for
RedHat, hardcoding paths related to the installed package; these changes
cause issues and are reverted by this commit.

The changes were originally prompted by (new) spec acceptance tests
leveraging passenger-status (to verify that passenger is running); these
tests were not working under RedHat; revisiting with the original
default parameters revealed that the RedHat tests were misconfigured
(the required PASSENGER_TMPDIR environment was not being set), so those
have been corrected.

Also, spec/class tests expecting the default parameters have been
reverted as well.