Ensure an assertion failure in a gofunc is reported correctly
Ensure an assertion failure in a gofunc is reported correctly

Assertion failures in go funcs show up as panics without a call to GinkgoRecover

[#170807218](https://www.pivotaltracker.com/story/show/170807218)

Co-authored-by: Andrew Crump <bad96bc28586e95c5d7da81c13d926ea5028b22f@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli