Add unit test to skip the blackhole route
Add unit test to skip the blackhole route

Signed-off-by: Hanlin Shi <b367e5959fb36689be5ef62431f31cc135d04090@vmware.com>

gu-bin/bosh-agent,cloudfoundry/bosh-agent,gu-bin/bosh-agent,gu-bin/bosh-agent,cloudfoundry/bosh-agent