auth/standard_role_manager: Avoid string copies
auth/standard_role_manager: Avoid string copies

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