auth/service.cc: Remove redundant declarations
auth/service.cc: Remove redundant declarations

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