ISPN-2896 org.infinispan.lucene.DirectoryOnMultipleCachesTest.verifyInte...

...ndedLockCachesUsage fails randomly

https://issues.jboss.org/browse/ISPN-2896

when the value is 0, the key is removed async. I believe that this is the case. So I changed the test to don't check for key with value == 0 and later check if the keys was removed.