Use timed_dig in resolve route sli task
Use timed_dig in resolve route sli task

- This only captures the time to resolve and excludes the time to curl
the app - giving a more accurate timing

[#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