(FM-1907) Fix mod_negotation system tests

Previously we were including the base apache class and then including the
'apache::mod::negotiation' class. However the apache class includes
'apache::mod::negoatiation' by default. Telling apache not to use its
default mods fixes this error.

There was also a reference to '$mod_dir' when finding the negotiation.conf
instead of just 'mod_dir'.

s/puppet code/ruby code/g fixed the issue. :)
(FM-1908) fixup mod_php tests

Previously we were testing that the source attribute for
apache::mod::php overrode the content and template attributes. This
began failing with the removal of files/spec file (it was the target
used by the source attribute in testing. These are the kinds of tests
that are slated for removal with the test refactor, best course is to
remove them now.
(FM-1911) Fixup passenger system test

Previously we were running a command via sudo, which requires a TTY. The
testing framework does not allocate a TTY by default, passing the
`:pty => true` option corrects this.
(FM-1913) fix passenger tests on EL derivatives

Previously we were excluding by "operatingsystem" == "RedHat" which
doesn't account for RedHat derivatives like Centos. This changes the
tests to check against "osfamily" instead.
Merge pull request #861 from justinstoller/bug/master/FM-1913-passenger-fails-on-el-7

(FM-1913) fix passenger tests on EL derivatives
Merge pull request #860 from justinstoller/bug/master/FM-1911-passenger-needs-pty

(FM-1911) Fixup passenger system test
Merge pull request #859 from justinstoller/bug/master/1908-fixup-mod_php

(FM-1908) fixup mod_php tests
Merge pull request #858 from justinstoller/bug/master/1907-fixup-mod_negotiation

(FM-1907) Fix mod_negotation system tests