ssh_client: switch builds to `set -e` mode

Tidy up the need for "|| exit 1" everywhere.

Change-Id: I550ffa57fc28673e39ce522a15bdb5f54da9e0a4
Reviewed-on: https://chromium-review.googlesource.com/435445
Reviewed-by: Rob Ginda <rginda@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
2 files changed