Samuel Dionne-Riel 3aab228d09 Revert "Add ssh backdoor to VM tests infrastructure."
This reverts commit d6e3db44cf09d04f0a3cd5b7ccb4a5dc3b7bfaa9.

See #53935 for explanations. In short, it may be causing issues with
tests on the build infrastructure.
2019-01-19 13:24:39 -05:00
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