Add a jenkins.sh to run these tests

This adds a jenkins.sh script which will run the tests from Jenkins.

The defaults with no environment is to run `go test -edgeHost 172.16.20.10 -skipVerifyTLS` and
`TEST_EDGEHOST` will override the edgeHost (for verifying against a real CDN) and setting
`TEST_VERIFYTLS` to `"yes"` will enable TLS verification if you have a real certificate for
your CDN service.