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)
Too bad the sweet spot is different for core and query :) I was hoping to just change the `infinispan.test.parallel.threads` default in `parent/pom.xml`, so that the user would still be able to run the whole suite on a single thread with `mvn install -Dinfinispan.test.parallel.threads=1` if he wanted to.