test: replaced fixturesDir with fixtures module
This was an assigned task at Node.js Interactive North America 2017. This replaced the fixturesDir exported by the common module with the fixtures.path() function on the fixtures module.
The now superfluous import of path was removed.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test