GitLab

Updates the string for kErrorStartingTermina and adds strings for kErrorOffline,
kErrorFetchingSshKeys and kErrorMountingContainer.

Change-Id: I0a1fba8179d4f32f99cb376922633578b332a912
Reviewed-on: https://chromium-review.googlesource.com/1255762
Commit-Queue: Josh Pratt <jopra@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595888}