Match "down" on insufficient resources test
Match "down" on insufficient resources test

This change is analogous to the change in the DATs at https://github.com/cloudfoundry-incubator/diego-acceptance-tests/blob/2304d3e7670893ba22b59f2eb2130f384d25c0a8/diego/instance_reporting_test.go, related to Diego story https://www.pivotaltracker.com/story/show/110347652.
cloudfoundry/wats,cloudfoundry-incubator/wats,cloudfoundry-incubator/wats,cloudfoundry/wats,cloudfoundry/wats,cloudfoundry-incubator/wats,cloudfoundry/wats,cloudfoundry-incubator/wats,cloudfoundry/wats,cloudfoundry-incubator/wats