Honour RAILS_LOG_TO_STDOUT for GdsApi client logs.
Honour RAILS_LOG_TO_STDOUT for GdsApi client logs.

All of our logs need to go to stdout/stderr when running on k8s.

See alphagov/publisher#1603 for context. This is essentially the same
change.

https://trello.com/c/Jef1t4xU

alphagov/smart-answers,alphagov/smart-answers,alphagov/smart-answers,alphagov/smart-answers