haproxy for ironic-api HEAD -> GET
haproxy for ironic-api HEAD -> GET

Change-Id: Id5e6439d68aa04aefbc22ba88258cc225e956638
Closes-Bug: 1640388
(cherry picked from commit a7e430e8f2f2d6fbc5a4139b55fcb648c8851e4a)

yanyao/newton,yanyao/newton