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This syncs the set of permissions from Secure Shell that we want/use
in newer versions of hterm.

Bug: 822490, 646690
Change-Id: I7abadb369b3178739808aa41fd0cae9ef3c0759e
Reviewed-on: https://chromium-review.googlesource.com/1061619Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559417}