Earlier, when local query processor wasn't available at
the beginning of system start, we couldn't query our own
host id when initializing the raft group registry. The local
host id is needed by the registry since it is responsible
to route RPC messages to specific raft groups, and needs
to reject messages destined to a different host.
Now that the host id is known early at boot, remove the optional
and pass host id in the constructor. Resolves an earlier fixme.
50140980ac