update init command to send RPC calls over SSH tunnel

internal/sshexec/remote.go

@@ -1,4 +1,4 @@
-package cmdexec
+package sshexec
 
 import (
 	"context"
@@ -11,6 +11,10 @@ type Remote struct {
 	client *ssh.Client
 }
 
+func NewRemote(client *ssh.Client) *Remote {
+	return &Remote{client: client}
+}
+
 // Run runs the command on the remote host and returns its output with all leading and trailing
 // white space removed.
 func (r *Remote) Run(ctx context.Context, cmd string) (string, error) {