[lago] Fork 'lago' project to 'lago-ost'
The github repository we currently use for Lago development has serious CI problems and doesn't use STDCI. Since moving the project to STDCI is hard and Lago is not maintained as a general-purpose tool anymore, let's:
fork the project to gerrit as 'lago-ost'
make the new project use STDCI and d/s PSI (the throw-away-VMs implementation, not the static agents)
mark the current project on github as EOLed