msg/async/ProtocolV2: include entity_name, features in reconnect

msg/async/ProtocolV2: include entity_name, features in reconnect

- A connects to B
- A sends client_ident
- fault before A gets server_ident, so A doesn't know B's features or name
- B reconnects to A
- connection established

A thinks B is unknown.0 and has not idea what the featurs are.

Fix this by including id and featurs in reconnect.  We don't know the type, but that is
included in TAG_HELLO in another branch, which will be merged separately; add a

Signed-off-by: Sage Weil <sage@redhat.com>