GitLab

Net tests broke because test process' /data directories are now isolated
and can't be used for sharing data out-of-process. The net test launcher
depends on the old behavior for deploying configuration files to test
code.

This CL designates a special path "/data/shared" into which shared
files will be placed. The shared directory will be mounted at
"/test-shared" in the test process' namespace.

The net test launcher & test code are modified to use the new paths.

TBR=mmenke@chromium.org

Bug: 891732
Change-Id: Id94bffe05a3b140ed60e42507cdc8d238677f202
Reviewed-on: https://chromium-review.googlesource.com/c/1259829
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597193}