useless configuration options in 'nova.conf'

I was trying to add a retry for glance operations via nova. I came across below options defined in the conf:

[glance]
..
#connect_retries = <None>
#connect_retry_delay = <None>
#status_code_retries = <None>
#status_code_retry_delay = <None>
=======================================

I tried to set some value for `connect_retries` and tried to reproduce a connection error for the snapshot upload. Somehow the `connect_retries` value is not getting picked up. I tried to search these options in
the code also(nova/nova/conf/glance.py), but could not find them.

let me know if this is a known issue. could not find any duplicate bug for this.

Nova release version: Train