terminus site deploy should exit with a non-zero status if deploy fails

[bwood]

Version

0.13.3

Expected behavior

terminus site deploy should exit with a non-zero status if deploy fails.

Actual behavior

Here are two snippets from a script which execs terminus site deploy and then checks the exit status. In these two cases the exit status was 0, but the log level was "error".

terminus site deploy --site=upgrade-testing-0110-diversity-ob-dl-02 --env=live --cc --updatedb --note="Deployed by klu via /usr/local/bin/istdrupal-updates-apply" --format=json
date: 2016-11-17 01:28:08
level: ERROR
message: cURL error 7: Failed to connect to terminus.pantheon.io port 443: Connection refused (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

terminus site hostnames list --site=optometry-ob --env=live
Would you like to deploy code from Test to live?  (y/n): y
terminus site deploy --site=optometry-ob --env=live --cc --updatedb --note="Deployed by annagaz via /usr/local/bin/istdrupal-updates-apply" --format=json
date: 2016-11-18 22:08:53
level: ERROR
message: Successfully queued converge_appserver_binding

Steps to reproduce the behavior

Apologies, but I couldn't find a way to reproduce this. I tried creating a TCP error, but got a different message.

Perhaps the timestamps, site names and messages will be useful in tracking down these conditions. If not, I understand. Just thought it might be worth reporting.