MT#9941 Consider PBX hunt parameters on subscriber creation via API

(cherry picked from commit 8b09bd0777ebe326c79f71e382f51fd5899ac5e1)
(cherry picked from commit 91c885888e828bdfe32fb57371b64abdbceb86cd)
MT#9941 Add cloud_pbx_hunt_* fields to api.

So can be specified without old pbx_hunt_[policy|timeout]

(cherry picked from commit 59bfbeb4010899a1c3d800ba817520f0ae78c85c)
(cherry picked from commit f15ee1feb4e913c65a28d76d87e5383e0280145a)