Stop running smoke tests except on unless we push or prod or staging.

Motivation: stop running them on dependapot branches/PRs since they 
don't make sense.

.travis.yml

@@ -141,6 +141,6 @@ stages:
 - name: test
   if: type != cron
 - name: smoke
-  if: type NOT IN (cron, pull_request)
+  if: type NOT IN (cron, pull_request) AND (branch =~ /^(develop|master|release|hotfix/)/)
 - name: update translations
   if: branch == develop AND type == cron