Added timeout to embedded replica sync.

[xonx4l]

closes issue-:#1224

Let's add a timeout to embedded replica sync so that we don't hang a sync() call if there's a network issue.

[haaawk]

Thanks you for your contribution @xonx4l but this adds a timeout only to a test. It won't help at all with #1224.

[xonx4l]

@haaawk thanks for the feedback could you please provide me more info on the issue ??