ISPN-4524 ClusteredCacheWithAsyncDirTest.testCombinationOfFilters random...

... failures

https://issues.jboss.org/browse/ISPN-4524

This test has a 100% success rate on a multicore physical machine (the whole query suite runs on under 50 seconds on my machine), but the default timeout makes it fragile on saturated CPU situations such as low-end ec2 instances (where TeamCity runs on)
I tested the query suite on several servers: 2, 4, 8 and 16 cores, 5 threads seems to be the sweet spot. 
Instead of setting it at agent level (thus having to remember everytime a new build is created), I found it'd be better to put here