Revert "Revert "Increase gorouter number of idle connections""
Revert "Revert "Increase gorouter number of idle connections""

This reverts commit be3a17cd9c53499893bce4fcd6b31664bb4c9ff1.

I also changed the comment to match reality

Signed-off-by: Toby Lorne <527052641d65eef236eeef9545b2acac74c35d57@digital.cabinet-office.gov.uk>

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf