Do not re-attempt (with an error) when a director http error code is returned
Do not re-attempt (with an error) when a director http error code is returned

[#135739609](https://www.pivotaltracker.com/story/show/135739609)

Signed-off-by: Shatarupa Nandi <3efeaa499e3e1d586e0cf648346ba222fe46816b@pivotal.io>

cloudfoundry/bosh-utils,cloudfoundry/bosh-utils