Ehnance and organize all testing tools & resources in one place

[atsakiridis]

Impacts, adding them as I go:

• Move all needed node scripts in test/load-testing
• Try to unify the 3 node scripts (i.e. server.js, server-secure.js and application-server.js) to one script that will serve the automated.html page both on http & https and also provide a REST service to retrieve the RCML for the circular tests
• rename automated.html to webrtc-client.html and default to bob/1234 if no username/pass as passed in the URL
• Get rid of the perl script for provisioning Restcomm Clients and spawning Chrome tabs (this will now happen through Sellenium) and use python for the same functionality now that it's still pretty minimal and porting will happen in a snap, so that we don't have so many code bases to maintain.