Add timed_dig endpoint to proxy app
Add timed_dig endpoint to proxy app

- Used by resolve route sli task

[#158468189]

Signed-off-by: Tyler Schultz <6b7a73f4f7cffc2a148becd12890940350ddfa95@pivotal.io>

cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release