cql3/statements: Use namespaces in index_target.cc file
cql3/statements: Use namespaces in index_target.cc file

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