Minor patch

[KaraMelih]

I made some necessary changes;

• auth instance is passed around but was not an argument of the function. I added that as an optional argument so it is more flexible. (And is a must for xenon to manually pass hop.Auth() instance)
• I added a "testing" key to the messages submitted within scenarios, so that CS can look for this key and bypass neutrino-from-future check.
• I added a way of checking the user's experiment ONLY ONCE in the first time they execute any script. It prompts the list of experiment, user enters the index and from then on the detector name is always what they chose. (Can always be changed afterwards from the env file, but one needs to find it)
• I added an (amazing) connection checker. It opens two streams one for subscribing one for publishing. It publishes a message with "_id=test-connection" and with current time, with status "sending", and waits. CS sees this messages, submits the same message only changing the status to "received", and the subscribed stream sees this match, confirms connection.

[KaraMelih]

tests are failing because of this initial one-time-only input request. @joesmolsky is there a way to select one number in the tests?