fix: this prevents possible loops while connecting (#521)

A recent change made it possible to get stuck in a loop when connecting
to a remote. This reverts the part of it that caused this while
retaining the other behavior. This makes it possible to add to blank
known_host files again. It also adds a printout to display when a
connection is complete.

wavesrv/pkg/remote/remote.go

@@ -1733,6 +1733,7 @@ func (msh *MShellProc) Launch(interactive bool) {
 		msh.ServerProc = cproc
 		msh.Status = StatusConnected
 	})
+	msh.WriteToPtyBuffer("connected to %s\n", remoteCopy.RemoteCanonicalName)
 	go func() {
 		exitErr := cproc.Cmd.Wait()
 		exitCode := shexec.GetExitCode(exitErr)