io_queue: remove owner number from metric name
io_queue: remove owner number from metric name

The owner number that is part of the type_instance name causes each of
the metric names to be unique, and prevent the dashboard to aggregate them.

See scylladb/scylla#1983

Signed-off-by: Amnon Heiman <ed5fc74c4692051ad0b19749fd7cea6ec2d74b9e@scylladb.com>
Message-Id: <1483373454-10876-1-git-send-email-ed5fc74c4692051ad0b19749fd7cea6ec2d74b9e@scylladb.com>

dreamsxin/seastar,cloudius-systems/seastar,scylladb/seastar,avikivity/seastar,cloudius-systems/seastar,cloudius-systems/seastar,dreamsxin/seastar,syuu1228/seastar,syuu1228/seastar,avikivity/seastar,scylladb/seastar,scylladb/seastar,avikivity/seastar,dreamsxin/seastar,syuu1228/seastar