bug#23170: Shepherd doesn't restart previously running dependent services

[Thompson, David]

If service 'foo' is depended on by service 'bar', and both are
running, and one runs 'herd restart foo', both 'foo' and 'bar' are
stopped, but then only 'foo' is restarted.  I think that the dependent
services that were stopped should also be restarted, otherwise the
user has to manually start them back up one at a time.

- Dave