Distributed unit tests and SSL doesn't have a valid keystore

[Markus Jelsma]

Hi - in a small Maven project depending on Solr 4.10.3, running unit tests that 
extend BaseDistributedSearchTestCase randomly fail with "SSL doesn't have a 
valid keystore", and a lot of zombie threads. We have a solrtest.keystore file 
laying around, but where to put it?

Thanks,
Markus