Repair tests in regress

[bassosimone]

For this first release, I guess it would be enough to know which tests to keep and which tests to remove inside regress. And to make sure the tests to keep continue working.

[bassosimone]

Since we did not applied large chunks of changes since we forked from neubot/neubot, I guess we can postpone this task a little bit and start with blessing the first release.

So, we can deploy the release onto a specific mlab sliver and start throwing traffic at it to see whether it behaves. I will add the task of reintegrating tests to the next release, which maybe can even occur earlier than we scheduled, when we have some interesting stuff to push.