bump container grace time to 1 hour
bump container grace time to 1 hour

this is more of a safety valve; right now long actions (e.g. a download)
can legitimately take longer than the current grace period

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release