Remove unused functions from FNDS, SNDF, KNDF

This removes several unused functions from the new classes/interfaces and one from an existing interface. Total list:

• matchClientKey removed from KademliaNetworkDatabaseFacade.java( Closes #466 (closed) )
• getKnownRouterData removed from FloodfillNetworkDatabaseSegmentor
• getClientSubNetDbs removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• getFloodfillPeers removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• isInitialized removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• lookupLeaseSetHashIsClient removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• getRoutersKnownToClients removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• getLeasesKnownToClients removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• getLocalClientsBlindData removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• reseedChecker removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade
• getLocalClientsBlindData removed from FloodfillNetworkDatabaseSegmentor and SegmentedNetworkDatabaseFacade

Also removes isRouterInfo from DatabaseEntry( Closes #440 (closed) ) Also removes minFloodfillPeers from FloodfillNetworkDatabaseFacade( Closes #463 (closed) ) Also removes toBase32 from LookupDestJob( Closes #462 (closed) )