travis: Print debug info to catch travis regressions

.travis.yml

@@ -12,6 +12,8 @@ dist: xenial
 apt:
   update: true
 before_install:
+  # print some debug issue to help catch the constant travis regressions
+  - if [ -e /etc/apt/sources.list.d/ ]; then sudo ls -l /etc/apt/sources.list.d/; fi
   # workaround broken travis NO_PUBKEY errors
   - if [ -e /etc/apt/sources.list.d/rabbitmq_rabbitmq-server.list ]; then sudo rm -f /etc/apt/sources.list.d/rabbitmq_rabbitmq-server.list; fi
   - if [ -e /etc/apt/sources.list.d/github_git-lfs.list ]; then sudo rm -f /etc/apt/sources.list.d/github_git-lfs.list; fi