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

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

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

(cherry picked from commit 59bfbeb4010899a1c3d800ba817520f0ae78c85c)