cql3: make primary key restrictions' values unambiguous
cql3: make primary key restrictions' values unambiguous

using directive must be used to disambiguate the overridden method.

scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,duarten/scylla