PTFM-13510: Making the deepdirs test less fragile
PTFM-13510: Making the deepdirs test less fragile

Summary: Simplifying script a little, by avoiding pushd/popd. This seems to fix running on jenkins.

Test Plan: This is an existing test.

Reviewers: bagee

Reviewed By: bagee

Differential Revision: https://phabricator.dnanexus.com/D144

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