Add redacting curl command
Add redacting curl command

[#163530540](https://www.pivotaltracker.com/story/show/163530540)

Signed-off-by: Sebastian Vidrio <68ba84219e4e2d7d15fed3ed668bd2821314e420@pivotal.io>

cloudfoundry-incubator/cf-test-helpers,cloudfoundry-incubator/cf-test-helpers