Replace usage of `common.fixturesDir` with the `path` method from the fixtures module
requested to merge github/fork/jeskew/fix/replace-fixturesDir-with-fixturesPath-in-https-agent-sockets-leak-test into master
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
Test
This commit was opened from the Node.JS interactive code & learn summit. It replaces a usage of common.fixturesDir with the fixtures module.