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Separate mw-selenium setup/teardown and be strict

Description

Separate mw-selenium setup/teardown and be strict

Reimplemented mw-selenium-teardown as separate setup/teardown scripts
that mkdir/rm respectively. Refactored TMPDIR workaround in
mw-set-env-mw-selenium to simply reuse global-set-env but set a flag
instructing the latter to skip assignment of TMPDIR to the tmpfs path.

Change-Id: If13aadef929d4b2e7682cc5c2bbe79e474b7c3ba
Follow-up: I49216b4985f911ef273751976c2c73bdcb43f502