Cannot pass environment variables to extended tests

[enj]

vagrant-openshift only supports sending environment variables to make. It would be useful to send environment variables to extended tests to allow for better control on how they run.

[stevekuznetsov]

@danmcp the correct fix for this is to make the extended tests in origin a make target that takes params: script names, env, and ginkgo focus, then rip out the special logic for them in vagrant test-origin