Travis tests failing on most runs

[lukehoban]

The most recent 17 nightly runs of https://travis-ci.com/pulumi/pulumi-cloud/builds have failed.

The most recent failed with:

    --- FAIL: Test_Examples//home/travis/gopath/src/github.com/pulumi/pulumi-cloud/aws/tests/unit (2402.13s)
    	examples_harness.go:186: Expected to get status code 200 for https://rpk9s32tp3.execute-api.us-east-1.amazonaws.com/stage//unittests. Got: 504
    	examples_harness.go:186: Expected to get status code 200 for https://rpk9s32tp3.execute-api.us-east-1.amazonaws.com/stage//unittests. Got: 500
    	examples_harness.go:186: Expected to get status code 200 for https://rpk9s32tp3.execute-api.us-east-1.amazonaws.com/stage//unittests. Got: 500
    	examples_harness.go:186: Expected to get status code 200 for https://rpk9s32tp3.execute-api.us-east-1.amazonaws.com/stage//unittests. Got: 500
                        	Error Trace:	examples_harness.go:193
    					aws_test.go:284
    					aws_test.go:176
    					program.go:981
    					program.go:730
    					program.go:603
    					program.go:442
    					aws_test.go:227
    			Error:		Not equal: 200 (expected)
    			        != 500 (actual)
    			Messages:	Got unexpected status code

[CyrusNajmabadi]

Ths was caused by a behavior change in supertest here: ladjs/supertest#509