ISPN-4444 After state transfer, a node is able to read keys it no longer...

... owns from its data container

* mark the keys stored as L1
* this avoid read the keys that are going to be invalidated during the ST

https://issues.jboss.org/browse/ISPN-4444
I would go to the extreme and remove all the ```InternalCacheEntry``` implementation and have only a ```MetadataInternalCacheEntry``` where we check if it is mortal/transient/L1 based on the metadata ...