[Fuchsia] Increase SSH keep-alive interval

Previously ServerAliveInterval and ServerAliveCountMax were both set
to 1 in SSH config used to connect to Fuchsia from the runner script.
This means that SSH diconnects after it fails to deliver 1 keep-alive
message within 1 second.
This interval is too short, which was causing timeouts and spurious
test failures in net_unittests. Increase these values to 2 and 5.

BUG=847915

Change-Id: I88d786626512f08da19444615f13285aac461dcb
Reviewed-on: https://chromium-review.googlesource.com/1079325
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563058}
1 file changed