Print out additional information when we fail to update.

We add crossystem debugging to what we print out on a failed
update check as well as cgpt show output.

BUG=chromium-os:35992
TEST=running

Change-Id: I681efc408aad64a59558127749340b341022b5e9
Reviewed-on: https://gerrit.chromium.org/gerrit/37294
Commit-Ready: Chris Sosa <sosa@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
2 files changed