ISPN-4520 JdbcBinaryStoreTest.testLoadAndStoreWithLifespanAndIdle random...

... failures

* Increased the timeout to avoid false positives

https://issues.jboss.org/browse/ISPN-4520
```
[ERROR] /Users/g/Go/upstream/infinispan.git/core/src/test/java/org/infinispan/persistence/BaseStoreTest.java:[295,7] cannot find symbol
  symbol:   method CpurgeExpired(java.util.Set<java.lang.String>,int)
  location: class org.infinispan.persistence.BaseStoreTest
```