ISPN-3241 Don't make the memcached server overwrite the cache configuraiton if it already exists
Bump to 5.2.8-SNAPSHOT
ISPN-3366 Data loss when entry forwarding to primary owner and primary owner shutdown

* Always reply with a CacheNotFoundResponse when the requested cache is not running.
* Throw a RemoteException(NamedCacheNotFoundException) from RpcManagerImpl, if strictPeerToPeer = true.
* Throw an OutdatedTopologyException from NonTxConcurrentDistributionInterceptor, if strictPeerToPeer = false.
* Catch OutdatedTopologyException in StateTransferInterceptor and retry the operation.