The default exec timeout in puppet is 300 seconds, this can be a
very long while on services that do not return immediately.
With default values, a command that never returns we're looking at
10*300 seconds (or 50 minutes).
Let's default to something more reasonable, 60 seconds, and also
make it configurable.
Change-Id: I53bd4935fbbb3a86ac1ad522a0f3d8f017151dd0
ab226968e0