Modified versions in pom.xml files to 5.3.0-SNAPSHOT
ISPN-2804 Added executor to clean up the completed transaction table.
Slight cleanup

* Javadoc for getNormalizedHash() in Util and ConsistentHash
* Remove redundant "normalization" checks in ConsistentHashV1.getServer()
ISPN-2788 NullPointerException appears in case passing null as an exclusion list to LuceneCacheLoader.loadAllKeys()
ISPN-2800 Make sure the JDBC XSD refers to simpleConnection and not singleConnection
ISPN-2658 Fix expected value MarshalledValueTest.testModificationsOnSameCustomKey

After fixing ISPN-2803 the key is not added in StateConsumerImpl.updatedKeys so no extra comparison (and serialization) is done. Decrease expected value by 1.
ISPN-2794 Stop the CacheManager when the servlet context is destroyed
ISPN-2795 JGroups 3.2.7.Final
ISPN-2805 Disable UNICAST / UNICAST2 connection reaping