Introduce a g5k launcher

tasks:

- deploy: take ownership of a g5k node and deploy tansiv and some vm
  according to the passed parameters (e.g platform, deployment...)
- validate: (naive for now) runs fping on all networks on all vms. Print
  the output (visual check).
- destroy: release the g5k resources
5 jobs for !7 with dev/g5k_dummy_validation in 26 minutes and 26 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Build
passed #884131
large
build

00:09:51

 
  Publish
passed #884237
large
docker

00:16:34

failed #884132
large
docker

00:02:11

failed #884218
large
docker

00:02:09

failed #884235
large
docker

00:02:06