Sleep for one second before running.

This avoids the case where the Sensu client is restarted successfully,
but is still in the window where the port isn't quite setup.
I ran this test a couple times and AFAICT the window is on the order of about a quarter of a second. It's pretty short. This is kind of an edge case, so I think it's probably okay to just sleep for a second and call it good. I could implement some looping logic but it seems like overkill IMO.