This pull request removes seastar namespace imports from the header
files. There are some additional cleanups to make that easier and to
remove some commented out code.
Closes#8202
* github.com:scylladb/scylla:
redis: Remove seastar namespace import from query_processor.hh
redis: Switch to seastar::sharded<> in query_procesor.hh
redis: Remove seastar namespace import from query_utils.hh
redis: Remove seastar namespace import from reply.hh
redis: Remove commented out code from options.hh
redis: Remove seastar namespace import from options.hh
redis: Remove seastar namespace import from service.hh
redis: Switch to seastar::sharded<> in service.{hh,cc}
redis: Remove unneeded include from keyspace_utils.hh
redis: Remove seastar namespace import from keyspace_utils.hh
redis: Remove seastar namespace import from command_factory.hh
redis: Fix include path in command_factory.hh
redis: Remove unneeded includes from command_factory.hh