We should document all Messages and all message members for the *.proto files in:

• https://github.com/kata-containers/agent/tree/master/protocols/grpc

This will:

• improve comprehension, thus making it easier to understand and review the protocol
  (which might indirectly help ensure the protocol is as safe as possible).
• help avoid issues like network: device and name seem to be duplicate field #147.

Additional to the description, we should pay particular attention to string fields due to their increased flexibility (and thus increased ability to confuse):

• What is the format of each string member?
• Can the value be ""? If so, what does it mean?
• Are there any other "special" values (like the terrible golang net.IP "<nil>" value)?

Example where we have ambiguity:

message StringUser {
	string uid = 1;
	string gid = 2;
	repeated string additionalGids = 3;
}

Are those member values numbers encoded as strings ("3", "1000", "0")? Or can they also (?) be specified as symbolics ("adm", "james", "root")?