Changes:
createZone API:
- This API takes in domainid, set it to the zone record in the data_center table
updateZone API:
- This API uses 'isPublic' flag to set a private zone to public - if this flag is set and the zone is dedicated, release the dedication and remove the domainid from the data_center table
listZone API:
- This API already has 'domainid' parameter. We should allow list zones by domain for Root admin.
DedicateZone API:
- set domainid in the data_center table
ReleaseDedicatedZone API:
- remove zoneid from the data_center table