Bucket creation unsupported/undocumented during cbbackumgr restore

If you try to cbbackupmgr restore while bucket doesn't exist at the destination, you receive following error: Error restoring cluster: Recieved error 404 while executing "PUT http://172.19.0.10:8091/couchBase/beer-sample/_design/beer"

backup-meta.json file contains value "allow_bucket_creation" but:
1) it can't be set with cbbackumgr config - or it it can than it is undocumented (first thing that requires fix)
2) even after I manually modified backup-meta.json and set "allow_bucket_creation" to true, I still got same 404 error.

Bottom line: we should support bucket creation when restoring, it should be part of "cbbackumgr config" and should be documented.