Index logs/tempest.txt for logstash queries

We need to index the tempest log so we can fingerprint errors using
multiple parts of the same traceback which doesn't work with the
console.html log.

Closes-Bug: #1323713

Change-Id: I34b2d67e12199ef0145d7a8d25d5385f944c78ed
Merge "Index logs/tempest.txt for logstash queries"