Close request file handler even if underlying client errors.
Close request file handler even if underlying client errors.

[#139968731](https://www.pivotaltracker.com/story/show/139968731)

Signed-off-by: Rob Day-Reynolds <904086f049d807ae99640dbdfde98536a5822f56@pivotal.io>

cloudfoundry/bosh-utils,cloudfoundry/bosh-utils