wireproto: only expose "hello" command to version 1 transports...
wireproto: only expose "hello" command to version 1 transports
This command is only ever used for the handshake in the SSH protocol.
We probably don't even need for it to be a proper command. Let's not
carry it forward to version 2 because I don't see a use for it there.
Differential Revision:
https://phab.mercurial-scm.org/D3183