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This PR fixes screwdriver-cd/screwdriver#1163.
When a user execute sd-step, it tries to install habitat package every time.
I fixed that by checking if a package is installed or not with hab pkg path and installing the package only when non-existent.
Note:
hab pkg path exits with zero when a package exists, otherwise non-zero.
Diff with -w option is recommended: https://github.com/screwdriver-cd/sd-step/pull/13/files?w=1