Named containers

[alexvanin]

After nspcc-dev/neofs-contract#134 container contract has container.Put and container.PutNamed methods.

Storage node

On container put request, Storage node should parse container attributes. If it contains __NEOFS__NAME and optional __NEOFS__ZONE attributes, then it should invoke container.PutNamed. Otherwise invoke container.Put.

Alphabet node

Notary enabled

Parse notary notifications of container.PutNamed method. Process it the same way as container.Put.

Notary disabled

container.PutNamed produces the same notification as container.Put. If we keep it as it is, then Alphabet node must check container attributes. If __NEOFS__NAME and optional __NEOFS_ZONE are present and container is valid, then invoke container.PutNamed. If container is valid but attributes are missing, invoke container.Put.

[alexvanin]

__NEOFS__ZONE can be omitted. Then container contract uses default zone.

[cthulhu-rider]

__NEOFS__ZONE can be empty or omitted.

Spec says it can't be empty.

[alexvanin]

__NEOFS__ZONE can be empty or omitted.

Spec says it can't be empty.

Updated comment and issue description.