Adding new basic routing table implementation

routingtable/client_interface.go

routingtable/client_manager.go

routingtable/rib_interface.go

routingtable/routingtable/adjRIBIn/adj_rib_in.go

routingtable/routingtable/client_interface.go

routingtable/routingtable/client_manager.go

routingtable/routingtable/rib_interface.go

routingtable/routingtable/table.go

routingtable/routingtable/table_test.go

routingtable/routingtable/trie.go

routingtable/routingtable/trie_test.go

routingtable/table.go

routingtable/table_test.go

routingtable/trie.go

routingtable/trie_test.go