[9.2.x] Child not marking parent down when parent is not running

[jasmine-nahrain]

I noticed that when the parent is not running, the child is unable to mark the parent down. Based on default configs, the child should retry the connection to the parent three times (proxy.config.http.connect_attempts_rr_retries) then if it is not successful, mark the parent down. However at the moment it is unable to try the connection three times and instead returns the 502 error on the first retry.

To reproduce,

• Set up ats with a parent/child config
• Make an call to ATS when the parent is not running