Integration tests log dumping stopped working in travis

E. g. [here](https://travis-ci.org/apache/incubator-druid/jobs/568383623):
```
0.00s$ for v in ~/shared/logs/*.log ; do echo $v logtail ======================== ; tail -100 $v ; done
/home/travis/shared/logs/*.log logtail ========================
tail: cannot open '/home/travis/shared/logs/*.log' for reading: No such file or directory
```

Start with the linked Travis CI job and the shell command that attempts to tail files under ~/shared/logs/*.log. Trace the integration-test CI log collection setup and confirm that completed jobs once again expose those logs instead of reporting that the path does not exist.

Written by the indexing model from the issue text.