Increase default sleep period to avoid stepping on upstart.

The default sleep period would cause a race condition with upstart
wherein the package installation would call an upstart start and before
it could complete, bootstrap would call another. The result was *two*
copies of salt running which ended up causing a most stubborn bug that's
documented in salt:#12248
Merge pull request #445 from cachedout/12248

Increase default sleep period to avoid stepping on upstart.